<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.wfscorp.com/role/AccountsReceivable" xlink:href="int-20161130.xsd#AccountsReceivable" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/AccountsReceivableDetails" xlink:href="int-20161130.xsd#AccountsReceivableDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/AccountsReceivableTables" xlink:href="int-20161130.xsd#AccountsReceivableTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsAndDivestitures" xlink:href="int-20161130.xsd#AcquisitionsAndDivestitures" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2014NarrativeDetails" xlink:href="int-20161130.xsd#AcquisitionsAndDivestitures2014NarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2014PurchasePriceAllocationDetails" xlink:href="int-20161130.xsd#AcquisitionsAndDivestitures2014PurchasePriceAllocationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2015NarrativeDetails" xlink:href="int-20161130.xsd#AcquisitionsAndDivestitures2015NarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2015PurchasePriceAllocationDetails" xlink:href="int-20161130.xsd#AcquisitionsAndDivestitures2015PurchasePriceAllocationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2016NarrativeDetails" xlink:href="int-20161130.xsd#AcquisitionsAndDivestitures2016NarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2016PurchasePriceAllocationDetails" xlink:href="int-20161130.xsd#AcquisitionsAndDivestitures2016PurchasePriceAllocationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsAndDivestituresTables" xlink:href="int-20161130.xsd#AcquisitionsAndDivestituresTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsAndDivestituresUnauditedProFormaResultsDetails" xlink:href="int-20161130.xsd#AcquisitionsAndDivestituresUnauditedProFormaResultsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/BasisOfPresentationAndSignificantAccountingPolicies" xlink:href="int-20161130.xsd#BasisOfPresentationAndSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/BasisOfPresentationAndSignificantAccountingPoliciesEarningsPerCommonShareDetails" xlink:href="int-20161130.xsd#BasisOfPresentationAndSignificantAccountingPoliciesEarningsPerCommonShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/BasisOfPresentationAndSignificantAccountingPoliciesPolicies" xlink:href="int-20161130.xsd#BasisOfPresentationAndSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/BasisOfPresentationAndSignificantAccountingPoliciesPoliciesDetails" xlink:href="int-20161130.xsd#BasisOfPresentationAndSignificantAccountingPoliciesPoliciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/BasisOfPresentationAndSignificantAccountingPoliciesTables" xlink:href="int-20161130.xsd#BasisOfPresentationAndSignificantAccountingPoliciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationAndMajorCustomers" xlink:href="int-20161130.xsd#BusinessSegmentsGeographicInformationAndMajorCustomers" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationAndMajorCustomersBalanceSheetItemsDetails" xlink:href="int-20161130.xsd#BusinessSegmentsGeographicInformationAndMajorCustomersBalanceSheetItemsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationAndMajorCustomersGeographicSummaryDetails" xlink:href="int-20161130.xsd#BusinessSegmentsGeographicInformationAndMajorCustomersGeographicSummaryDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationAndMajorCustomersIncomeStatementItemsDetails" xlink:href="int-20161130.xsd#BusinessSegmentsGeographicInformationAndMajorCustomersIncomeStatementItemsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationAndMajorCustomersTables" xlink:href="int-20161130.xsd#BusinessSegmentsGeographicInformationAndMajorCustomersTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsAndContingencies" xlink:href="int-20161130.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsAndContingenciesBondsLeasesAndSalesAndPurchaseCommitmentsDetails" xlink:href="int-20161130.xsd#CommitmentsAndContingenciesBondsLeasesAndSalesAndPurchaseCommitmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsAndContingenciesDeferredCompensationDetails" xlink:href="int-20161130.xsd#CommitmentsAndContingenciesDeferredCompensationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsAndContingenciesEmploymentAgreementsDetails" xlink:href="int-20161130.xsd#CommitmentsAndContingenciesEmploymentAgreementsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsAndContingenciesLegalTaxAndOtherMattersDetails" xlink:href="int-20161130.xsd#CommitmentsAndContingenciesLegalTaxAndOtherMattersDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsAndContingenciesTables" xlink:href="int-20161130.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedBalanceSheets" xlink:href="int-20161130.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="int-20161130.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="int-20161130.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsOfCashFlowsParenthetical" xlink:href="int-20161130.xsd#ConsolidatedStatementsOfCashFlowsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome" xlink:href="int-20161130.xsd#ConsolidatedStatementsOfIncomeAndComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncomeParenthetical" xlink:href="int-20161130.xsd#ConsolidatedStatementsOfIncomeAndComprehensiveIncomeParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsOfShareholdersEquity" xlink:href="int-20161130.xsd#ConsolidatedStatementsOfShareholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsOfShareholdersEquityParenthetical" xlink:href="int-20161130.xsd#ConsolidatedStatementsOfShareholdersEquityParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/CorrectionOfPreviouslyIssuedFinancialInformation" xlink:href="int-20161130.xsd#CorrectionOfPreviouslyIssuedFinancialInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/CorrectionOfPreviouslyIssuedFinancialInformationConsolidatedBalanceSheetsDetails" xlink:href="int-20161130.xsd#CorrectionOfPreviouslyIssuedFinancialInformationConsolidatedBalanceSheetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/CorrectionOfPreviouslyIssuedFinancialInformationConsolidatedBalanceSheetsSharesInformationDetails" xlink:href="int-20161130.xsd#CorrectionOfPreviouslyIssuedFinancialInformationConsolidatedBalanceSheetsSharesInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/CorrectionOfPreviouslyIssuedFinancialInformationConsolidatedStatementsOfIncomeAndComprehensiveIncomeDetails" xlink:href="int-20161130.xsd#CorrectionOfPreviouslyIssuedFinancialInformationConsolidatedStatementsOfIncomeAndComprehensiveIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/CorrectionOfPreviouslyIssuedFinancialInformationTables" xlink:href="int-20161130.xsd#CorrectionOfPreviouslyIssuedFinancialInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/Debt" xlink:href="int-20161130.xsd#Debt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/DebtAggregateAnnualMaturitiesDetails" xlink:href="int-20161130.xsd#DebtAggregateAnnualMaturitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/DebtInstrumentsDetails" xlink:href="int-20161130.xsd#DebtInstrumentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/DebtInterestIncomeExpenseAndOtherFinancingCostsDetails" xlink:href="int-20161130.xsd#DebtInterestIncomeExpenseAndOtherFinancingCostsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/DebtSummaryAndMaturitiesDetails" xlink:href="int-20161130.xsd#DebtSummaryAndMaturitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/DebtTables" xlink:href="int-20161130.xsd#DebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/DerivativeInstruments" xlink:href="int-20161130.xsd#DerivativeInstruments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/DerivativeInstrumentsBalanceSheetLocationDetails" xlink:href="int-20161130.xsd#DerivativeInstrumentsBalanceSheetLocationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/DerivativeInstrumentsEffectOnIncomeDetails" xlink:href="int-20161130.xsd#DerivativeInstrumentsEffectOnIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/DerivativeInstrumentsGrossNotionalValuesDetails" xlink:href="int-20161130.xsd#DerivativeInstrumentsGrossNotionalValuesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/DerivativeInstrumentsTables" xlink:href="int-20161130.xsd#DerivativeInstrumentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/DocumentAndEntityInformation" xlink:href="int-20161130.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/FairValueMeasurements" xlink:href="int-20161130.xsd#FairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/FairValueMeasurementsAssetsAndLiabilitiesDetails" xlink:href="int-20161130.xsd#FairValueMeasurementsAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/FairValueMeasurementsCommodityAndForeignCurrencyContractsDetails" xlink:href="int-20161130.xsd#FairValueMeasurementsCommodityAndForeignCurrencyContractsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/FairValueMeasurementsLevel3InputsDetails" xlink:href="int-20161130.xsd#FairValueMeasurementsLevel3InputsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/FairValueMeasurementsTables" xlink:href="int-20161130.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillAndIdentifiableIntangibleAssets" xlink:href="int-20161130.xsd#GoodwillAndIdentifiableIntangibleAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillAndIdentifiableIntangibleAssetsFutureEstimatedAmortizationOfIdentifiableIntangibleAssetsDetails" xlink:href="int-20161130.xsd#GoodwillAndIdentifiableIntangibleAssetsFutureEstimatedAmortizationOfIdentifiableIntangibleAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillAndIdentifiableIntangibleAssetsGoodwillDetails" xlink:href="int-20161130.xsd#GoodwillAndIdentifiableIntangibleAssetsGoodwillDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillAndIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails" xlink:href="int-20161130.xsd#GoodwillAndIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillAndIdentifiableIntangibleAssetsTables" xlink:href="int-20161130.xsd#GoodwillAndIdentifiableIntangibleAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxes" xlink:href="int-20161130.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxesIncomeTaxContingenciesDetails" xlink:href="int-20161130.xsd#IncomeTaxesIncomeTaxContingenciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxesNetOperatingLossesAndIncomeTaxConcessionsDetails" xlink:href="int-20161130.xsd#IncomeTaxesNetOperatingLossesAndIncomeTaxConcessionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxesTables" xlink:href="int-20161130.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxesTaxProvisionBenefitReconciliationAndTaxRatesDetails" xlink:href="int-20161130.xsd#IncomeTaxesTaxProvisionBenefitReconciliationAndTaxRatesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxesTemporaryDifferencesDetails" xlink:href="int-20161130.xsd#IncomeTaxesTemporaryDifferencesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/PropertyAndEquipment" xlink:href="int-20161130.xsd#PropertyAndEquipment" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/PropertyAndEquipmentDetails" xlink:href="int-20161130.xsd#PropertyAndEquipmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/PropertyAndEquipmentTables" xlink:href="int-20161130.xsd#PropertyAndEquipmentTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquity" xlink:href="int-20161130.xsd#ShareholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityDividendsAndStockRepurchaseProgramsDetails" xlink:href="int-20161130.xsd#ShareholdersEquityDividendsAndStockRepurchaseProgramsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityOtherComprehensiveLossAndAccumulatedOtherComprehensiveLossDetails" xlink:href="int-20161130.xsd#ShareholdersEquityOtherComprehensiveLossAndAccumulatedOtherComprehensiveLossDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityPlanSummaryAndDescriptionDetails" xlink:href="int-20161130.xsd#ShareholdersEquityPlanSummaryAndDescriptionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityRestrictedStockAwardsDetails" xlink:href="int-20161130.xsd#ShareholdersEquityRestrictedStockAwardsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityRsuAwardsAndSsarAwardsDetails" xlink:href="int-20161130.xsd#ShareholdersEquityRsuAwardsAndSsarAwardsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityTables" xlink:href="int-20161130.xsd#ShareholdersEquityTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityUnrecognizedCompensationCostDetails" xlink:href="int-20161130.xsd#ShareholdersEquityUnrecognizedCompensationCostDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnaudited" xlink:href="int-20161130.xsd#SummaryQuarterlyInformationUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnauditedDetails" xlink:href="int-20161130.xsd#SummaryQuarterlyInformationUnauditedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnauditedTables" xlink:href="int-20161130.xsd#SummaryQuarterlyInformationUnauditedTables" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AccountsReceivable" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AccountsReceivableDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems" xlink:label="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_FD208DB17CFEA06CBDF90975160B3E68" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureTable" xlink:label="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureTable_0BDC9CD54B96914C38A50975160B12AB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_FD208DB17CFEA06CBDF90975160B3E68" xlink:to="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureTable_0BDC9CD54B96914C38A50975160B12AB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_79CD29D8B7243086EAC90975160B8125" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureTable_0BDC9CD54B96914C38A50975160B12AB" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_79CD29D8B7243086EAC90975160B8125" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_DA7E992A3FEFC61098EF0975160B3EE6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_79CD29D8B7243086EAC90975160B8125" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_DA7E992A3FEFC61098EF0975160B3EE6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_DA7E992A3FEFC61098EF0975160B3EE6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_79CD29D8B7243086EAC90975160B8125" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_DA7E992A3FEFC61098EF0975160B3EE6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsMember" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsMember_6E4E3D3EA0DC78064CDD0975160BB03A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_DA7E992A3FEFC61098EF0975160B3EE6" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsMember_6E4E3D3EA0DC78064CDD0975160BB03A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_9855C031751B7928405E0975160B873B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_FD208DB17CFEA06CBDF90975160B3E68" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_9855C031751B7928405E0975160B873B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationAllowancesAndReservesBalance" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_1537F78067A888520E7A0975160B205E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_FD208DB17CFEA06CBDF90975160B3E68" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_1537F78067A888520E7A0975160B205E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_83E5F8A93985637ED0870975160BAFFF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_FD208DB17CFEA06CBDF90975160B3E68" xlink:to="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_83E5F8A93985637ED0870975160BAFFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_90F15DA0431B21E25AAA0975160B1E80" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_83E5F8A93985637ED0870975160BAFFF" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_90F15DA0431B21E25AAA0975160B1E80" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDeductions" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDeductions_7B6A4999F0AADCDA25BD0975160BB2DA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_83E5F8A93985637ED0870975160BAFFF" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDeductions_7B6A4999F0AADCDA25BD0975160BB2DA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationAllowancesAndReservesRecoveries" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesRecoveries_12EA7A92C457BDC9A25B0975160B81A7" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_83E5F8A93985637ED0870975160BAFFF" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesRecoveries_12EA7A92C457BDC9A25B0975160B81A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationAllowancesAndReservesAdjustments" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesAdjustments_524A0789D8A9424037550975160B9033" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_83E5F8A93985637ED0870975160BAFFF" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesAdjustments_524A0789D8A9424037550975160B9033" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AccountsReceivableTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AcquisitionsAndDivestitures" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2014NarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_17E55298B8F0DF6A6A633D6E6A48D122" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_17E55298B8F0DF6A6A633D6E6A48D122" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_382AE32D19A0543E71AE3D6E6A48C470" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_17E55298B8F0DF6A6A633D6E6A48D122" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_382AE32D19A0543E71AE3D6E6A48C470" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE82A66FB794DC9860173D6E6A48D85E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_382AE32D19A0543E71AE3D6E6A48C470" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE82A66FB794DC9860173D6E6A48D85E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE82A66FB794DC9860173D6E6A48D85E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_382AE32D19A0543E71AE3D6E6A48C470" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE82A66FB794DC9860173D6E6A48D85E" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_WatsonPetroleumLimitedMember" xlink:label="loc_int_WatsonPetroleumLimitedMember_6EE758C64042D8E201963D6E6A48107D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE82A66FB794DC9860173D6E6A48D85E" xlink:to="loc_int_WatsonPetroleumLimitedMember_6EE758C64042D8E201963D6E6A48107D" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ColtInternationalLLCMember" xlink:label="loc_int_ColtInternationalLLCMember_31C7500C2BB945B48B483D6E6A48F318" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE82A66FB794DC9860173D6E6A48D85E" xlink:to="loc_int_ColtInternationalLLCMember_31C7500C2BB945B48B483D6E6A48F318" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_Acquisitions2014Member" xlink:label="loc_int_Acquisitions2014Member_98478E7C2E65BAABFC823D6E6A48B20F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE82A66FB794DC9860173D6E6A48D85E" xlink:to="loc_int_Acquisitions2014Member_98478E7C2E65BAABFC823D6E6A48B20F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_E5C60032D7458D49F29F3D6E6A4879D7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_17E55298B8F0DF6A6A633D6E6A48D122" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_E5C60032D7458D49F29F3D6E6A4879D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_7BEF8FA9BBFCF2E8CB613D6E6A487BFC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_E5C60032D7458D49F29F3D6E6A4879D7" xlink:to="loc_us-gaap_SegmentDomain_7BEF8FA9BBFCF2E8CB613D6E6A487BFC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_7BEF8FA9BBFCF2E8CB613D6E6A487BFC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_E5C60032D7458D49F29F3D6E6A4879D7" xlink:to="loc_us-gaap_SegmentDomain_7BEF8FA9BBFCF2E8CB613D6E6A487BFC" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_AviationSegmentMember" xlink:label="loc_int_AviationSegmentMember_4D88C6B764473D00C7E73D6E6A49ED47" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_7BEF8FA9BBFCF2E8CB613D6E6A487BFC" xlink:to="loc_int_AviationSegmentMember_4D88C6B764473D00C7E73D6E6A49ED47" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_MarineSegmentMember" xlink:label="loc_int_MarineSegmentMember_F0790F76994EA958EFAD3D6E6A493777" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_7BEF8FA9BBFCF2E8CB613D6E6A487BFC" xlink:to="loc_int_MarineSegmentMember_F0790F76994EA958EFAD3D6E6A493777" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_722F8011F9241E155ED73D6E6A49DE50" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_17E55298B8F0DF6A6A633D6E6A48D122" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_722F8011F9241E155ED73D6E6A49DE50" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_BA2D3C3736BBE164C52F3D6E6A49BBE0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_722F8011F9241E155ED73D6E6A49DE50" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_BA2D3C3736BBE164C52F3D6E6A49BBE0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_BA2D3C3736BBE164C52F3D6E6A49BBE0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_722F8011F9241E155ED73D6E6A49DE50" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_BA2D3C3736BBE164C52F3D6E6A49BBE0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_DDB4A3BBADE4E2E4D4163D6E6A49FB29" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_BA2D3C3736BBE164C52F3D6E6A49BBE0" xlink:to="loc_us-gaap_CustomerRelationshipsMember_DDB4A3BBADE4E2E4D4163D6E6A49FB29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_34822B1F5AC9D8BF02FB3D6E6A49DF2E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_BA2D3C3736BBE164C52F3D6E6A49BBE0" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_34822B1F5AC9D8BF02FB3D6E6A49DF2E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_6CDFFF17EACFD0FE47503D6E6A49B13C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_17E55298B8F0DF6A6A633D6E6A48D122" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_6CDFFF17EACFD0FE47503D6E6A49B13C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_60CCE5A320F6700819543D6E6A49E9FA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_6CDFFF17EACFD0FE47503D6E6A49B13C" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_60CCE5A320F6700819543D6E6A49E9FA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_60CCE5A320F6700819543D6E6A49E9FA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_6CDFFF17EACFD0FE47503D6E6A49B13C" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_60CCE5A320F6700819543D6E6A49E9FA" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_TrademarksTradeNamesRightsMember" xlink:label="loc_int_TrademarksTradeNamesRightsMember_DF20D90ED30C420CFC273D6E6A49B19C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_60CCE5A320F6700819543D6E6A49E9FA" xlink:to="loc_int_TrademarksTradeNamesRightsMember_DF20D90ED30C420CFC273D6E6A49B19C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_B1E23CAE1DB8BC0D63373D6E6A49BD59" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_B1E23CAE1DB8BC0D63373D6E6A49BD59" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_NumberOfLocations" xlink:label="loc_int_NumberOfLocations_A953EC403400B4ECEB843D6E6A491D52" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:to="loc_int_NumberOfLocations_A953EC403400B4ECEB843D6E6A491D52" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NumberOfBusinessesAcquired" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_1DD43A95E15DE5AABC9F3D6E6A49B520" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_1DD43A95E15DE5AABC9F3D6E6A49B520" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncreaseDecreaseInRestrictedCash" xlink:label="loc_us-gaap_IncreaseDecreaseInRestrictedCash_1724962EF2BFB6B48D563D6E6A4911F3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:to="loc_us-gaap_IncreaseDecreaseInRestrictedCash_1724962EF2BFB6B48D563D6E6A4911F3" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationAmountsDueToSellers" xlink:label="loc_int_BusinessCombinationAmountsDueToSellers_63C97D53194DFA71FF8D3D6E6A498196" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:to="loc_int_BusinessCombinationAmountsDueToSellers_63C97D53194DFA71FF8D3D6E6A498196" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_IncreaseDecreaseInAmountsDueToSellers" xlink:label="loc_int_IncreaseDecreaseInAmountsDueToSellers_7CB8B91C35CAACBD81413D6E6A499BC0" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:to="loc_int_IncreaseDecreaseInAmountsDueToSellers_7CB8B91C35CAACBD81413D6E6A499BC0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_6E385447E2647FD0E14B3D6E6A4A4C56" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:to="loc_us-gaap_Goodwill_6E385447E2647FD0E14B3D6E6A4A4C56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_B7C9D084588A18175EBB3D6E6A4A434F" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_B7C9D084588A18175EBB3D6E6A4A434F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_AE1D8AFB29E943B57D823D6E6A4AB26C" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_AE1D8AFB29E943B57D823D6E6A4AB26C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_41C1CBD879BB169B0CED3D6E6A4AD94D" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2E888039F2ECE2EDC9453D6E6A49D87A" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_41C1CBD879BB169B0CED3D6E6A4AD94D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2014PurchasePriceAllocationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_8DD1A46E6BF1F85756913D6E6A3E82A8" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1FF7CF3135E38D8F36143D6E6A3E5908" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8DD1A46E6BF1F85756913D6E6A3E82A8" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1FF7CF3135E38D8F36143D6E6A3E5908" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_429312A7E7AAC437A1A43D6E6A3E8B50" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1FF7CF3135E38D8F36143D6E6A3E5908" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_429312A7E7AAC437A1A43D6E6A3E8B50" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DCEF0023783E349E466B3D6E6A3EC6A0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_429312A7E7AAC437A1A43D6E6A3E8B50" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DCEF0023783E349E466B3D6E6A3EC6A0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DCEF0023783E349E466B3D6E6A3EC6A0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_429312A7E7AAC437A1A43D6E6A3E8B50" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DCEF0023783E349E466B3D6E6A3EC6A0" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_Acquisitions2014Member" xlink:label="loc_int_Acquisitions2014Member_5B3C29A27DD5FF8D4BDB3D6E6A3EB524" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DCEF0023783E349E466B3D6E6A3EC6A0" xlink:to="loc_int_Acquisitions2014Member_5B3C29A27DD5FF8D4BDB3D6E6A3EB524" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_9C6103A3E0119EF67BDB3D6E6A3E8F03" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8DD1A46E6BF1F85756913D6E6A3E82A8" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_9C6103A3E0119EF67BDB3D6E6A3E8F03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashAcquiredFromAcquisition" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_C098E5C07159AA50C2003D6E6A3E8AC0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8DD1A46E6BF1F85756913D6E6A3E82A8" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_C098E5C07159AA50C2003D6E6A3E8AC0" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationPurchasePriceNetOfCashAcquired" xlink:label="loc_int_BusinessCombinationPurchasePriceNetOfCashAcquired_DD51D95466BAB73AC2D53D6E6A3E6BCD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8DD1A46E6BF1F85756913D6E6A3E82A8" xlink:to="loc_int_BusinessCombinationPurchasePriceNetOfCashAcquired_DD51D95466BAB73AC2D53D6E6A3E6BCD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_F56DABD434501DE340D53D6E6A3EDB41" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8DD1A46E6BF1F85756913D6E6A3E82A8" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_F56DABD434501DE340D53D6E6A3EDB41" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationConsiderationTransferredAmountDueFromToAcquiree" xlink:label="loc_int_BusinessCombinationConsiderationTransferredAmountDueFromToAcquiree_ACF7A300A557266F94773D6E6A3E7EA4" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8DD1A46E6BF1F85756913D6E6A3E82A8" xlink:to="loc_int_BusinessCombinationConsiderationTransferredAmountDueFromToAcquiree_ACF7A300A557266F94773D6E6A3E7EA4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_D685725F016B4421BADA3D6E6A3FEBA7" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8DD1A46E6BF1F85756913D6E6A3E82A8" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_D685725F016B4421BADA3D6E6A3FEBA7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_C6C0ACF643E0F1AAEDE33D6E6A3F1FC9" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8DD1A46E6BF1F85756913D6E6A3E82A8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_C6C0ACF643E0F1AAEDE33D6E6A3F1FC9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_27B8F0572C2CA75FFCC13D6E6A3F2D04" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_C6C0ACF643E0F1AAEDE33D6E6A3F1FC9" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_27B8F0572C2CA75FFCC13D6E6A3F2D04" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_27DB9F969935E59D27223D6E6A3F1D8A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_C6C0ACF643E0F1AAEDE33D6E6A3F1FC9" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_27DB9F969935E59D27223D6E6A3F1D8A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_07D951CDC63495B571E43D6E6A3F038A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_C6C0ACF643E0F1AAEDE33D6E6A3F1FC9" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_07D951CDC63495B571E43D6E6A3F038A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_B77C44F64F1BE5AC22A83D6E6A3FCCF8" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_C6C0ACF643E0F1AAEDE33D6E6A3F1FC9" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_B77C44F64F1BE5AC22A83D6E6A3FCCF8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_9A9E586EB2AFDDED05223D6E6A3F9083" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_C6C0ACF643E0F1AAEDE33D6E6A3F1FC9" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_9A9E586EB2AFDDED05223D6E6A3F9083" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_BFFB12C00CB14177F66A3D6E6A3F70F2" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_C6C0ACF643E0F1AAEDE33D6E6A3F1FC9" xlink:to="loc_us-gaap_Goodwill_BFFB12C00CB14177F66A3D6E6A3F70F2" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets" xlink:label="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets_09E5181A8834FF19B3353D6E6A3FF49A" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_C6C0ACF643E0F1AAEDE33D6E6A3F1FC9" xlink:to="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets_09E5181A8834FF19B3353D6E6A3FF49A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_0A5CB2B90C1AC710011C3D6E6A3FDE39" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8DD1A46E6BF1F85756913D6E6A3E82A8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_0A5CB2B90C1AC710011C3D6E6A3FDE39" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_8B69EDEC2D751BE7CC723D6E6A3FF8AE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_0A5CB2B90C1AC710011C3D6E6A3FDE39" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_8B69EDEC2D751BE7CC723D6E6A3FF8AE" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities" xlink:label="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities_823A7553D5FDEA56FE6E3D6E6A3FD69C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_0A5CB2B90C1AC710011C3D6E6A3FDE39" xlink:to="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities_823A7553D5FDEA56FE6E3D6E6A3FD69C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_840F27309191E59D89C13D6E6A405D27" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_0A5CB2B90C1AC710011C3D6E6A3FDE39" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_840F27309191E59D89C13D6E6A405D27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_F4AEFAB2E2F470A9780A3D6E6A409F46" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_0A5CB2B90C1AC710011C3D6E6A3FDE39" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_F4AEFAB2E2F470A9780A3D6E6A409F46" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_D72E7CB073757645791D3D6E6A402DF5" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8DD1A46E6BF1F85756913D6E6A3E82A8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_D72E7CB073757645791D3D6E6A402DF5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2015NarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_63448C627214C8D349B338C49C6897EC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_63448C627214C8D349B338C49C6897EC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0C7122439BFB931B680938C49C68C249" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_63448C627214C8D349B338C49C6897EC" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0C7122439BFB931B680938C49C68C249" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_5B7A5D073659E4E22C8B38C49C68296D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0C7122439BFB931B680938C49C68C249" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_5B7A5D073659E4E22C8B38C49C68296D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_5B7A5D073659E4E22C8B38C49C68296D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0C7122439BFB931B680938C49C68C249" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_5B7A5D073659E4E22C8B38C49C68296D" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_PesterMember" xlink:label="loc_int_PesterMember_384C45C03461AEDAC2CF38C49C69F8D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_5B7A5D073659E4E22C8B38C49C68296D" xlink:to="loc_int_PesterMember_384C45C03461AEDAC2CF38C49C69F8D8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_4F3BA87EB5E30EC6916F38C49C69DF2B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_63448C627214C8D349B338C49C6897EC" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_4F3BA87EB5E30EC6916F38C49C69DF2B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_4771B62A52834543D0F538C49C6AD055_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_4F3BA87EB5E30EC6916F38C49C69DF2B" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_4771B62A52834543D0F538C49C6AD055_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_4771B62A52834543D0F538C49C6AD055" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_4F3BA87EB5E30EC6916F38C49C69DF2B" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_4771B62A52834543D0F538C49C6AD055" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DiscontinuedOperationsHeldforsaleMember" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_FB94909342893FBAAFD238C49C6AB15A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_4771B62A52834543D0F538C49C6AD055" xlink:to="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_FB94909342893FBAAFD238C49C6AB15A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_9964BB6F813930001E3038C49C6AE588" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_4771B62A52834543D0F538C49C6AD055" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_9964BB6F813930001E3038C49C6AE588" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_3647C7526C3F799035C838C49C6AB02E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_63448C627214C8D349B338C49C6897EC" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_3647C7526C3F799035C838C49C6AB02E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_105F5DF53E88A32DA69D38C49C6A8105_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_3647C7526C3F799035C838C49C6AB02E" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_105F5DF53E88A32DA69D38C49C6A8105_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_105F5DF53E88A32DA69D38C49C6A8105" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_3647C7526C3F799035C838C49C6AB02E" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_105F5DF53E88A32DA69D38C49C6A8105" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherIncomeMember" xlink:label="loc_us-gaap_OtherIncomeMember_3F49A0AB21403341B87C38C49C6AD35A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_105F5DF53E88A32DA69D38C49C6A8105" xlink:to="loc_us-gaap_OtherIncomeMember_3F49A0AB21403341B87C38C49C6AD35A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6F912E614B181BEA870638C49C6AC5EB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_63448C627214C8D349B338C49C6897EC" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6F912E614B181BEA870638C49C6AC5EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_8B5E4C7722A7B9A4F4AE38C49C6B250B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6F912E614B181BEA870638C49C6AC5EB" xlink:to="loc_us-gaap_SegmentDomain_8B5E4C7722A7B9A4F4AE38C49C6B250B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_8B5E4C7722A7B9A4F4AE38C49C6B250B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6F912E614B181BEA870638C49C6AC5EB" xlink:to="loc_us-gaap_SegmentDomain_8B5E4C7722A7B9A4F4AE38C49C6B250B" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LandSegmentMember" xlink:label="loc_int_LandSegmentMember_D50122C669696DED6ADE38C49C6BC220" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8B5E4C7722A7B9A4F4AE38C49C6B250B" xlink:to="loc_int_LandSegmentMember_D50122C669696DED6ADE38C49C6BC220" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_AviationSegmentMember" xlink:label="loc_int_AviationSegmentMember_020219F8BFB4140D4E9A38C49C6B6B30" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8B5E4C7722A7B9A4F4AE38C49C6B250B" xlink:to="loc_int_AviationSegmentMember_020219F8BFB4140D4E9A38C49C6B6B30" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_501A82ADC3EF10F66C9F38C49C6B3CCC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_63448C627214C8D349B338C49C6897EC" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_501A82ADC3EF10F66C9F38C49C6B3CCC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EB6E56BC563DAD6F858A38C49C6BDE4F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_501A82ADC3EF10F66C9F38C49C6B3CCC" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EB6E56BC563DAD6F858A38C49C6BDE4F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EB6E56BC563DAD6F858A38C49C6BDE4F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_501A82ADC3EF10F66C9F38C49C6B3CCC" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EB6E56BC563DAD6F858A38C49C6BDE4F" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_Acquisitions2015Member" xlink:label="loc_int_Acquisitions2015Member_787E4F6B24F08E51D4F238C49C6B5003" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EB6E56BC563DAD6F858A38C49C6BDE4F" xlink:to="loc_int_Acquisitions2015Member_787E4F6B24F08E51D4F238C49C6B5003" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_EB8593304E6EE88EC4AC38C49C6B3CFD" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_63448C627214C8D349B338C49C6897EC" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_EB8593304E6EE88EC4AC38C49C6B3CFD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7494661D47416611D89E38C49C6B0EC5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_EB8593304E6EE88EC4AC38C49C6B3CFD" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7494661D47416611D89E38C49C6B0EC5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7494661D47416611D89E38C49C6B0EC5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_EB8593304E6EE88EC4AC38C49C6B3CFD" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7494661D47416611D89E38C49C6B0EC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_4DE4D04EBA08E2C90B5D38C49C6B05AE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7494661D47416611D89E38C49C6B0EC5" xlink:to="loc_us-gaap_CustomerRelationshipsMember_4DE4D04EBA08E2C90B5D38C49C6B05AE" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_SupplierAgreementsMember" xlink:label="loc_int_SupplierAgreementsMember_16F6A252651BADD21C5F38C49C6B4449" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7494661D47416611D89E38C49C6B0EC5" xlink:to="loc_int_SupplierAgreementsMember_16F6A252651BADD21C5F38C49C6B4449" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_9D9D2ED9D480ED8EC55438C49C6BE045" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7494661D47416611D89E38C49C6B0EC5" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_9D9D2ED9D480ED8EC55438C49C6BE045" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_DE8CED584DCFBAC8158438C49C6B11F8" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_63448C627214C8D349B338C49C6897EC" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_DE8CED584DCFBAC8158438C49C6B11F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_FD0702774BBB621E511438C49C6B3226_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_DE8CED584DCFBAC8158438C49C6B11F8" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_FD0702774BBB621E511438C49C6B3226_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_FD0702774BBB621E511438C49C6B3226" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_DE8CED584DCFBAC8158438C49C6B11F8" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_FD0702774BBB621E511438C49C6B3226" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_TrademarksTradeNamesRightsMember" xlink:label="loc_int_TrademarksTradeNamesRightsMember_18FF5AA0629F31E57B3A38C49C6B68FC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_FD0702774BBB621E511438C49C6B3226" xlink:to="loc_int_TrademarksTradeNamesRightsMember_18FF5AA0629F31E57B3A38C49C6B68FC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_602D95E03197A9DAB85838C49C6C59F9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_602D95E03197A9DAB85838C49C6C59F9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_9A6F2EFE4172D5EA9DB638C49C6C299C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_9A6F2EFE4172D5EA9DB638C49C6C299C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_504295F78F59D373373F38C49C6C706B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_Goodwill_504295F78F59D373373F38C49C6C706B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_B2817C9A9C6F384DEA0138C49C6CCEC6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_B2817C9A9C6F384DEA0138C49C6CCEC6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_5ABDA5BDBE6B6276080638C49C6C67AC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_5ABDA5BDBE6B6276080638C49C6C67AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_83902F44E1ED9D2C264038C49C6C4C61" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_83902F44E1ED9D2C264038C49C6C4C61" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_8BB1E25B09503D19B7A938C49C6C1FE5" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_8BB1E25B09503D19B7A938C49C6C1FE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NumberOfBusinessesAcquired" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_C69CABF36D81FD01E3AB38C49C6CB19A" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_C69CABF36D81FD01E3AB38C49C6CB19A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_908E55624AF806AD85BF38C49C6CCB02" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_908E55624AF806AD85BF38C49C6CCB02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_08E1DDBD9276FD88F38938C49C6CAF08" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_08E1DDBD9276FD88F38938C49C6CAF08" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_0EB7952868E038C8927938C49C6C4953" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_0EB7952868E038C8927938C49C6C4953" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_9721D9AA9BE8EE39D58B38C49C6C4C0A" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C5F468256D335465A7F838C49C6BD817" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_9721D9AA9BE8EE39D58B38C49C6C4C0A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2015PurchasePriceAllocationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_8E7724E3DFC633A4E63B38C499B86B98" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_92412B28BAC2574AE51F38C499B78EC5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8E7724E3DFC633A4E63B38C499B86B98" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_92412B28BAC2574AE51F38C499B78EC5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_B4C16B837DC8B7CF01B538C499B8926D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_92412B28BAC2574AE51F38C499B78EC5" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_B4C16B837DC8B7CF01B538C499B8926D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_63C1EA42C05D0BB06F1D38C499B836C4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_B4C16B837DC8B7CF01B538C499B8926D" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_63C1EA42C05D0BB06F1D38C499B836C4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_63C1EA42C05D0BB06F1D38C499B836C4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_B4C16B837DC8B7CF01B538C499B8926D" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_63C1EA42C05D0BB06F1D38C499B836C4" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_Acquisitions2015Member" xlink:label="loc_int_Acquisitions2015Member_116725A5A7A3CA598B3038C499B8FC61" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_63C1EA42C05D0BB06F1D38C499B836C4" xlink:to="loc_int_Acquisitions2015Member_116725A5A7A3CA598B3038C499B8FC61" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_D4E7EA27B945B07590CC38C499B812D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8E7724E3DFC633A4E63B38C499B86B98" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_D4E7EA27B945B07590CC38C499B812D8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashAcquiredFromAcquisition" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_6374DA61DAAD882E80AF38C499B861D1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8E7724E3DFC633A4E63B38C499B86B98" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_6374DA61DAAD882E80AF38C499B861D1" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationPurchasePriceNetOfCashAcquired" xlink:label="loc_int_BusinessCombinationPurchasePriceNetOfCashAcquired_EDC1480975E96456FFED38C499B88B1F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8E7724E3DFC633A4E63B38C499B86B98" xlink:to="loc_int_BusinessCombinationPurchasePriceNetOfCashAcquired_EDC1480975E96456FFED38C499B88B1F" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationConsiderationTransferredAmountDueFromToAcquiree" xlink:label="loc_int_BusinessCombinationConsiderationTransferredAmountDueFromToAcquiree_787A2555A4922936631638C499B8224B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8E7724E3DFC633A4E63B38C499B86B98" xlink:to="loc_int_BusinessCombinationConsiderationTransferredAmountDueFromToAcquiree_787A2555A4922936631638C499B8224B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_C8EC41CB42F4D5999EE638C499B9AB48" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8E7724E3DFC633A4E63B38C499B86B98" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_C8EC41CB42F4D5999EE638C499B9AB48" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_A180D14F8A5DA335B47638C499B90F2E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8E7724E3DFC633A4E63B38C499B86B98" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_A180D14F8A5DA335B47638C499B90F2E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_0E2B402829B9FE2999D938C499B94844" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_A180D14F8A5DA335B47638C499B90F2E" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_0E2B402829B9FE2999D938C499B94844" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_5AE18A88B0D491C27BA838C499B9090B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_A180D14F8A5DA335B47638C499B90F2E" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_5AE18A88B0D491C27BA838C499B9090B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_1219C982470C235BC4B338C499B91401" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_A180D14F8A5DA335B47638C499B90F2E" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_1219C982470C235BC4B338C499B91401" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_E0147A17432E4D0B22A638C499B9A393" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_A180D14F8A5DA335B47638C499B90F2E" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_E0147A17432E4D0B22A638C499B9A393" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_28FFD6236BB2DF3BC7FD38C499B94454" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_A180D14F8A5DA335B47638C499B90F2E" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_28FFD6236BB2DF3BC7FD38C499B94454" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_9FB351024EE31DF284DC38C499B941DE" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_A180D14F8A5DA335B47638C499B90F2E" xlink:to="loc_us-gaap_Goodwill_9FB351024EE31DF284DC38C499B941DE" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets" xlink:label="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets_EE264F8643FD72D280EE38C499B960F6" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_A180D14F8A5DA335B47638C499B90F2E" xlink:to="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets_EE264F8643FD72D280EE38C499B960F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_28A50A7D508C2792B5C738C499BA1AAF" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8E7724E3DFC633A4E63B38C499B86B98" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_28A50A7D508C2792B5C738C499BA1AAF" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesShorttermDebt" xlink:label="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesShorttermDebt_A0F5BA57FB9D938DA03238C499BAE366" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_28A50A7D508C2792B5C738C499BA1AAF" xlink:to="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesShorttermDebt_A0F5BA57FB9D938DA03238C499BAE366" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_A870FD75F134F96F8BA038C499BA9564" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_28A50A7D508C2792B5C738C499BA1AAF" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_A870FD75F134F96F8BA038C499BA9564" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_1511165C0EBC5125C0E638C499BA4E44" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_28A50A7D508C2792B5C738C499BA1AAF" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_1511165C0EBC5125C0E638C499BA4E44" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities" xlink:label="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities_7CA0A370CEE18966091638C499BAA52A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_28A50A7D508C2792B5C738C499BA1AAF" xlink:to="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities_7CA0A370CEE18966091638C499BAA52A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_9CD33B820A97DAE5C7B038C499BA0689" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_28A50A7D508C2792B5C738C499BA1AAF" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_9CD33B820A97DAE5C7B038C499BA0689" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_85FFC5EE29B537FB479538C499BABA95" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8E7724E3DFC633A4E63B38C499B86B98" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_85FFC5EE29B537FB479538C499BABA95" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2016NarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4F2284F5CAE3166A3742487057D9ECD7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4F2284F5CAE3166A3742487057D9ECD7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_25873C99A570C42C264E487057DAF324" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4F2284F5CAE3166A3742487057D9ECD7" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_25873C99A570C42C264E487057DAF324" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_622E29FF21AA08095080487057DAE67A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_25873C99A570C42C264E487057DAF324" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_622E29FF21AA08095080487057DAE67A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_622E29FF21AA08095080487057DAE67A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_25873C99A570C42C264E487057DAF324" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_622E29FF21AA08095080487057DAE67A" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_AviationFuelingOperationsOfCertainExxonMobilAffiliatesMember" xlink:label="loc_int_AviationFuelingOperationsOfCertainExxonMobilAffiliatesMember_C00F9E53A6F871F63069487057DBE699" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_622E29FF21AA08095080487057DAE67A" xlink:to="loc_int_AviationFuelingOperationsOfCertainExxonMobilAffiliatesMember_C00F9E53A6F871F63069487057DBE699" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_Acquisitions2016Member" xlink:label="loc_int_Acquisitions2016Member_6E7ECAD3C99B1E93B5C8487057DB7360" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_622E29FF21AA08095080487057DAE67A" xlink:to="loc_int_Acquisitions2016Member_6E7ECAD3C99B1E93B5C8487057DB7360" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_TobrasMember" xlink:label="loc_int_TobrasMember_6036CFF30CAF945490BD487057DB0A21" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_622E29FF21AA08095080487057DAE67A" xlink:to="loc_int_TobrasMember_6036CFF30CAF945490BD487057DB0A21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_25E64253B961E1F454EA487057DB0531" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4F2284F5CAE3166A3742487057D9ECD7" xlink:to="loc_us-gaap_StatementScenarioAxis_25E64253B961E1F454EA487057DB0531" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_EC4786E4EA769DD13E69487057DB1FEF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_25E64253B961E1F454EA487057DB0531" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_EC4786E4EA769DD13E69487057DB1FEF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_EC4786E4EA769DD13E69487057DB1FEF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_25E64253B961E1F454EA487057DB0531" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_EC4786E4EA769DD13E69487057DB1FEF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScenarioForecastMember" xlink:label="loc_us-gaap_ScenarioForecastMember_C8D8B809125C8CA13817487057DBBD25" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_EC4786E4EA769DD13E69487057DB1FEF" xlink:to="loc_us-gaap_ScenarioForecastMember_C8D8B809125C8CA13817487057DBBD25" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2A6312BA3A368481161A487057DCEFA4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4F2284F5CAE3166A3742487057D9ECD7" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2A6312BA3A368481161A487057DCEFA4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_F2E381DA48837E939BDB487057DC21B4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2A6312BA3A368481161A487057DCEFA4" xlink:to="loc_us-gaap_SegmentDomain_F2E381DA48837E939BDB487057DC21B4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_F2E381DA48837E939BDB487057DC21B4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2A6312BA3A368481161A487057DCEFA4" xlink:to="loc_us-gaap_SegmentDomain_F2E381DA48837E939BDB487057DC21B4" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LandSegmentMember" xlink:label="loc_int_LandSegmentMember_DCA120774C97A6BBA663487057DC1B20" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_F2E381DA48837E939BDB487057DC21B4" xlink:to="loc_int_LandSegmentMember_DCA120774C97A6BBA663487057DC1B20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F7955CB2FF24940E9024487057DCE565" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4F2284F5CAE3166A3742487057D9ECD7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F7955CB2FF24940E9024487057DCE565" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_20184FD8474ADE810B39487057DC2FBA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F7955CB2FF24940E9024487057DCE565" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_20184FD8474ADE810B39487057DC2FBA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_20184FD8474ADE810B39487057DC2FBA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F7955CB2FF24940E9024487057DCE565" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_20184FD8474ADE810B39487057DC2FBA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_0EF941310AA98F7F4F5D487057DC0AD8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_20184FD8474ADE810B39487057DC2FBA" xlink:to="loc_us-gaap_CustomerRelationshipsMember_0EF941310AA98F7F4F5D487057DC0AD8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_27A73446390A9B942BEF487057DD3EE3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_20184FD8474ADE810B39487057DC2FBA" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_27A73446390A9B942BEF487057DD3EE3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_6325FCC3261BD4E575E6487057DD878E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4F2284F5CAE3166A3742487057D9ECD7" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_6325FCC3261BD4E575E6487057DD878E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_DC5827CBBF1EAD6F01A7487057DD61E9_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_6325FCC3261BD4E575E6487057DD878E" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_DC5827CBBF1EAD6F01A7487057DD61E9_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_DC5827CBBF1EAD6F01A7487057DD61E9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_6325FCC3261BD4E575E6487057DD878E" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_DC5827CBBF1EAD6F01A7487057DD61E9" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_TrademarksTradeNamesRightsMember" xlink:label="loc_int_TrademarksTradeNamesRightsMember_276D22FE8751EB1BAC7A487057DDA1DE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_DC5827CBBF1EAD6F01A7487057DD61E9" xlink:to="loc_int_TrademarksTradeNamesRightsMember_276D22FE8751EB1BAC7A487057DDA1DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_8F67163A6473053005E5487057DDDE47" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4F2284F5CAE3166A3742487057D9ECD7" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_8F67163A6473053005E5487057DDDE47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_CBBBC3D5734550AF732F487057DDB8CF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_8F67163A6473053005E5487057DDDE47" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_CBBBC3D5734550AF732F487057DDB8CF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_CBBBC3D5734550AF732F487057DDB8CF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_8F67163A6473053005E5487057DDDE47" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_CBBBC3D5734550AF732F487057DDB8CF" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_CrudeOilJointVenturePartnerMember" xlink:label="loc_int_CrudeOilJointVenturePartnerMember_826890AAC5317DFDC38B487057DD082C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_CBBBC3D5734550AF732F487057DDB8CF" xlink:to="loc_int_CrudeOilJointVenturePartnerMember_826890AAC5317DFDC38B487057DD082C" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_NumberOfAirportsToBeAcquired" xlink:label="loc_int_NumberOfAirportsToBeAcquired_0B4F10BA079F508D25BE487057DDB327" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_int_NumberOfAirportsToBeAcquired_0B4F10BA079F508D25BE487057DDB327" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_D19A48EE8FD6FFCA42ED487057DDE78A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_D19A48EE8FD6FFCA42ED487057DDE78A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NumberOfBusinessesAcquired" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_081B3E72124F58E6AEDA487057DE5EBD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_081B3E72124F58E6AEDA487057DE5EBD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_70FCFC3AF2EBF15D0905487057DE714B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_Goodwill_70FCFC3AF2EBF15D0905487057DE714B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_683782BE3C61D5A9CF32487057DE6D2B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_683782BE3C61D5A9CF32487057DE6D2B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_9459DD228C6437907C36487057DF41E3" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_9459DD228C6437907C36487057DF41E3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_4D611B43CB5E5C237807487057DFF237" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_4D611B43CB5E5C237807487057DFF237" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_9ABC4ABFABFC9402BDC0487057DF6068" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_9ABC4ABFABFC9402BDC0487057DF6068" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_40129C9B2B3C142D1EB9487057DF49BB" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_40129C9B2B3C142D1EB9487057DF49BB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_1E541CC478D33F2ED330487057DFCDD9" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_1E541CC478D33F2ED330487057DFCDD9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_6C0C48299D23DBC390D9487057DFDB5A" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_6C0C48299D23DBC390D9487057DFDB5A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_F8D6E32AE411F59AECED487057DFF9DE" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_F8D6E32AE411F59AECED487057DFF9DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_372961479FA41128C084487057DFFE87" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85AE2823EB6F8D5BC230487057DD4D63" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_372961479FA41128C084487057DFFE87" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AcquisitionsAndDivestitures2016PurchasePriceAllocationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_62C279F5F87A9FE9C09D25B60A237C83" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_FCC24F1DD15EABCB742A25B60A233F95" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62C279F5F87A9FE9C09D25B60A237C83" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_FCC24F1DD15EABCB742A25B60A233F95" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_93D98175B71C2EC86BB925B60A2388DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_FCC24F1DD15EABCB742A25B60A233F95" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_93D98175B71C2EC86BB925B60A2388DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CFAB74BD9E3A496D6F5E25B60A235062_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_93D98175B71C2EC86BB925B60A2388DF" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CFAB74BD9E3A496D6F5E25B60A235062_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CFAB74BD9E3A496D6F5E25B60A235062" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_93D98175B71C2EC86BB925B60A2388DF" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CFAB74BD9E3A496D6F5E25B60A235062" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_Acquisitions2016Member" xlink:label="loc_int_Acquisitions2016Member_F231D5C8685897DBCC7B25B60A2379FD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CFAB74BD9E3A496D6F5E25B60A235062" xlink:to="loc_int_Acquisitions2016Member_F231D5C8685897DBCC7B25B60A2379FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_50B979FAF50702E73C8325B60A234FE8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62C279F5F87A9FE9C09D25B60A237C83" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_50B979FAF50702E73C8325B60A234FE8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashAcquiredFromAcquisition" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_0A6B0CF8516157AC2A4625B60A23F052" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62C279F5F87A9FE9C09D25B60A237C83" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_0A6B0CF8516157AC2A4625B60A23F052" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationPurchasePriceNetOfCashAcquired" xlink:label="loc_int_BusinessCombinationPurchasePriceNetOfCashAcquired_D6E826C1FE3AC441AE1E25B60A23A194" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62C279F5F87A9FE9C09D25B60A237C83" xlink:to="loc_int_BusinessCombinationPurchasePriceNetOfCashAcquired_D6E826C1FE3AC441AE1E25B60A23A194" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationConsiderationTransferredAmountDueFromToAcquiree" xlink:label="loc_int_BusinessCombinationConsiderationTransferredAmountDueFromToAcquiree_D9A5FCF8F9D23719E20D25B60A24D57E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62C279F5F87A9FE9C09D25B60A237C83" xlink:to="loc_int_BusinessCombinationConsiderationTransferredAmountDueFromToAcquiree_D9A5FCF8F9D23719E20D25B60A24D57E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_6AB42E32531423929D8825B60A243AF1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62C279F5F87A9FE9C09D25B60A237C83" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_6AB42E32531423929D8825B60A243AF1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_D6BABF31023030E9B69425B60A240433" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62C279F5F87A9FE9C09D25B60A237C83" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_D6BABF31023030E9B69425B60A240433" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_92B6630E77677315A6D925B60A24C793" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_D6BABF31023030E9B69425B60A240433" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_92B6630E77677315A6D925B60A24C793" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_E7F5576E03790D1E422C25B60A24755B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_D6BABF31023030E9B69425B60A240433" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_E7F5576E03790D1E422C25B60A24755B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_196287013485C093280A25B60A24CA74" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_D6BABF31023030E9B69425B60A240433" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_196287013485C093280A25B60A24CA74" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_53E1D120FBADD9E8830F25B60A247B2A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_D6BABF31023030E9B69425B60A240433" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_53E1D120FBADD9E8830F25B60A247B2A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_CECA0923CE8B2A056FF825B60A24113E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_D6BABF31023030E9B69425B60A240433" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_CECA0923CE8B2A056FF825B60A24113E" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIntangibleAssetsandGoodwill" xlink:label="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIntangibleAssetsandGoodwill_52F4B3C1DE9EFF0BCA6525B60A249A87" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_D6BABF31023030E9B69425B60A240433" xlink:to="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIntangibleAssetsandGoodwill_52F4B3C1DE9EFF0BCA6525B60A249A87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_8FE34E26D0E0A8E8AFC625B60A24B44F" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_D6BABF31023030E9B69425B60A240433" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_8FE34E26D0E0A8E8AFC625B60A24B44F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_2DFB8512016C54F9200125B60A243E5D" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62C279F5F87A9FE9C09D25B60A237C83" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_2DFB8512016C54F9200125B60A243E5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_68742DDB67654597267D25B60A25B13F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_2DFB8512016C54F9200125B60A243E5D" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_68742DDB67654597267D25B60A25B13F" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities" xlink:label="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities_7BC87D7ACF639EC1C0DD25B60A2557DA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_2DFB8512016C54F9200125B60A243E5D" xlink:to="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities_7BC87D7ACF639EC1C0DD25B60A2557DA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_24BB6866A8F35AC1E9E625B60A25EE3F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_2DFB8512016C54F9200125B60A243E5D" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_24BB6866A8F35AC1E9E625B60A25EE3F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_D410504D18E7EDC6AF3525B60A25263D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_2DFB8512016C54F9200125B60A243E5D" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_D410504D18E7EDC6AF3525B60A25263D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AcquisitionsAndDivestituresTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/AcquisitionsAndDivestituresUnauditedProFormaResultsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_E1320044E4C3E77D6C683D6E6A62AB58" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1826213A58CE964117C33D6E6A62351D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_E1320044E4C3E77D6C683D6E6A62AB58" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1826213A58CE964117C33D6E6A62351D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_F13A0937B71CAD9789003D6E6A62F438" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1826213A58CE964117C33D6E6A62351D" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_F13A0937B71CAD9789003D6E6A62F438" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_39774B491C0CAD8E1E593D6E6A623259_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_F13A0937B71CAD9789003D6E6A62F438" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_39774B491C0CAD8E1E593D6E6A623259_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_39774B491C0CAD8E1E593D6E6A623259" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_F13A0937B71CAD9789003D6E6A62F438" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_39774B491C0CAD8E1E593D6E6A623259" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_Acquisitions2016and2015Member" xlink:label="loc_int_Acquisitions2016and2015Member_F93C859A4DD26194B6303D6E6A62B64D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_39774B491C0CAD8E1E593D6E6A623259" xlink:to="loc_int_Acquisitions2016and2015Member_F93C859A4DD26194B6303D6E6A62B64D" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_Acquisitions2015And2014Member" xlink:label="loc_int_Acquisitions2015And2014Member_5859AB618B9E86E270C93D6E6A6240C5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_39774B491C0CAD8E1E593D6E6A623259" xlink:to="loc_int_Acquisitions2015And2014Member_5859AB618B9E86E270C93D6E6A6240C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_8BF314EBC52AF62DED8F3D6E6A625F48" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_E1320044E4C3E77D6C683D6E6A62AB58" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_8BF314EBC52AF62DED8F3D6E6A625F48" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_5B7A648F631D993E3DEA3D6E6A6225CD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_E1320044E4C3E77D6C683D6E6A62AB58" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_5B7A648F631D993E3DEA3D6E6A6225CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EarningsPerShareProFormaAbstract" xlink:label="loc_us-gaap_EarningsPerShareProFormaAbstract_3F1B878CC636A1EF9BD03D6E6A62D47B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_E1320044E4C3E77D6C683D6E6A62AB58" xlink:to="loc_us-gaap_EarningsPerShareProFormaAbstract_3F1B878CC636A1EF9BD03D6E6A62D47B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_618B0F6AFE000257270F3D6E6A629F53" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareProFormaAbstract_3F1B878CC636A1EF9BD03D6E6A62D47B" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_618B0F6AFE000257270F3D6E6A629F53" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_C51F4ABA83F84FBB94BA3D6E6A631067" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareProFormaAbstract_3F1B878CC636A1EF9BD03D6E6A62D47B" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_C51F4ABA83F84FBB94BA3D6E6A631067" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/BasisOfPresentationAndSignificantAccountingPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/BasisOfPresentationAndSignificantAccountingPoliciesEarningsPerCommonShareDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/BasisOfPresentationAndSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/BasisOfPresentationAndSignificantAccountingPoliciesPoliciesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_8A7C944F1DD566D7FF712A70C6CAC0A9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3519F974D86C1A737CBD2A70C6C8E696" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8A7C944F1DD566D7FF712A70C6CAC0A9" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3519F974D86C1A737CBD2A70C6C8E696" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8A0203061DD529467AF92A70C6C8B2B3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3519F974D86C1A737CBD2A70C6C8E696" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8A0203061DD529467AF92A70C6C8B2B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5C6BAD2B6459DB0601992A70C6C87DD7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8A0203061DD529467AF92A70C6C8B2B3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5C6BAD2B6459DB0601992A70C6C87DD7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5C6BAD2B6459DB0601992A70C6C87DD7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8A0203061DD529467AF92A70C6C8B2B3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5C6BAD2B6459DB0601992A70C6C87DD7" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_TobrasMember" xlink:label="loc_int_TobrasMember_35EEA80DEB8E2797391F2A70C6C86BF9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5C6BAD2B6459DB0601992A70C6C87DD7" xlink:to="loc_int_TobrasMember_35EEA80DEB8E2797391F2A70C6C86BF9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_34B76128BB665FC69E862A70C6C821EA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3519F974D86C1A737CBD2A70C6C8E696" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_34B76128BB665FC69E862A70C6C821EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_64E0F0322B4ECA7B2D5F2A70C6C908F1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_34B76128BB665FC69E862A70C6C821EA" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_64E0F0322B4ECA7B2D5F2A70C6C908F1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_64E0F0322B4ECA7B2D5F2A70C6C908F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_34B76128BB665FC69E862A70C6C821EA" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_64E0F0322B4ECA7B2D5F2A70C6C908F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_35C203B080ABEC7AB7132A70C6C96AEF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_64E0F0322B4ECA7B2D5F2A70C6C908F1" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_35C203B080ABEC7AB7132A70C6C96AEF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_E5CAB4CEEA19F168CDB42A70C6C9E521" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3519F974D86C1A737CBD2A70C6C8E696" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_E5CAB4CEEA19F168CDB42A70C6C9E521" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_A4010C7140EA1C55A9D12A70C6C95A97_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_E5CAB4CEEA19F168CDB42A70C6C9E521" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_A4010C7140EA1C55A9D12A70C6C95A97_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_A4010C7140EA1C55A9D12A70C6C95A97" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_E5CAB4CEEA19F168CDB42A70C6C9E521" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_A4010C7140EA1C55A9D12A70C6C95A97" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_PesterMember" xlink:label="loc_int_PesterMember_09316243145E6A4F75152A70C6C92B2B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_A4010C7140EA1C55A9D12A70C6C95A97" xlink:to="loc_int_PesterMember_09316243145E6A4F75152A70C6C92B2B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_EB168FC9501EC61CA7762A70C6C9CAFB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3519F974D86C1A737CBD2A70C6C8E696" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_EB168FC9501EC61CA7762A70C6C9CAFB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_51473B4458F8E5A909BD2A70C6C96EC8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_EB168FC9501EC61CA7762A70C6C9CAFB" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_51473B4458F8E5A909BD2A70C6C96EC8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_51473B4458F8E5A909BD2A70C6C96EC8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_EB168FC9501EC61CA7762A70C6C9CAFB" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_51473B4458F8E5A909BD2A70C6C96EC8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherIncomeMember" xlink:label="loc_us-gaap_OtherIncomeMember_28F1B00E2A26BF43E7452A70C6C930D6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_51473B4458F8E5A909BD2A70C6C96EC8" xlink:to="loc_us-gaap_OtherIncomeMember_28F1B00E2A26BF43E7452A70C6C930D6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_2F936F74896A63F6E1BE2A70C6CAD32F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8A7C944F1DD566D7FF712A70C6CAC0A9" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_2F936F74896A63F6E1BE2A70C6CAD32F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_CAE80C2DFECE4DE9E69F2A70C6CA7E65" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8A7C944F1DD566D7FF712A70C6CAC0A9" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_CAE80C2DFECE4DE9E69F2A70C6CA7E65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_1DC34A6E7D44669B0C282A70C6CA0669" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8A7C944F1DD566D7FF712A70C6CAC0A9" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_1DC34A6E7D44669B0C282A70C6CA0669" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_6440F65778F342A831142A70C6CAE2DF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8A7C944F1DD566D7FF712A70C6CAC0A9" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_6440F65778F342A831142A70C6CAE2DF" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/BasisOfPresentationAndSignificantAccountingPoliciesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationAndMajorCustomers" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationAndMajorCustomersBalanceSheetItemsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_205CA60CB6105CC78EC605BD3F098A9D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_9B0B033F8BE161B383FE05BD3F08AECA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_205CA60CB6105CC78EC605BD3F098A9D" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_9B0B033F8BE161B383FE05BD3F08AECA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="loc_us-gaap_ConsolidationItemsAxis_4979CB1FAEDE3B21CCBB05BD3F0840CF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_9B0B033F8BE161B383FE05BD3F08AECA" xlink:to="loc_us-gaap_ConsolidationItemsAxis_4979CB1FAEDE3B21CCBB05BD3F0840CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_701BD4958B26F5E22A8E05BD3F08893B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConsolidationItemsAxis_4979CB1FAEDE3B21CCBB05BD3F0840CF" xlink:to="loc_us-gaap_ConsolidationItemsDomain_701BD4958B26F5E22A8E05BD3F08893B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_701BD4958B26F5E22A8E05BD3F08893B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConsolidationItemsAxis_4979CB1FAEDE3B21CCBB05BD3F0840CF" xlink:to="loc_us-gaap_ConsolidationItemsDomain_701BD4958B26F5E22A8E05BD3F08893B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_47DD0113EAE0822EE06505BD3F086DB5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConsolidationItemsDomain_701BD4958B26F5E22A8E05BD3F08893B" xlink:to="loc_us-gaap_OperatingSegmentsMember_47DD0113EAE0822EE06505BD3F086DB5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_8A28886D799CD642FCC505BD3F08C3B0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConsolidationItemsDomain_701BD4958B26F5E22A8E05BD3F08893B" xlink:to="loc_us-gaap_CorporateNonSegmentMember_8A28886D799CD642FCC505BD3F08C3B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_30186F1F85AAEB9BAE4005BD3F0846AE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_9B0B033F8BE161B383FE05BD3F08AECA" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_30186F1F85AAEB9BAE4005BD3F0846AE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_E473A6A2EF8C9E6E814205BD3F0954F4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_30186F1F85AAEB9BAE4005BD3F0846AE" xlink:to="loc_us-gaap_SegmentDomain_E473A6A2EF8C9E6E814205BD3F0954F4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_E473A6A2EF8C9E6E814205BD3F0954F4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_30186F1F85AAEB9BAE4005BD3F0846AE" xlink:to="loc_us-gaap_SegmentDomain_E473A6A2EF8C9E6E814205BD3F0954F4" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_AviationSegmentMember" xlink:label="loc_int_AviationSegmentMember_245035C19326E0A2ADA405BD3F09FC66" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_E473A6A2EF8C9E6E814205BD3F0954F4" xlink:to="loc_int_AviationSegmentMember_245035C19326E0A2ADA405BD3F09FC66" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_MarineSegmentMember" xlink:label="loc_int_MarineSegmentMember_158472A1620705D5309905BD3F091EFD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_E473A6A2EF8C9E6E814205BD3F0954F4" xlink:to="loc_int_MarineSegmentMember_158472A1620705D5309905BD3F091EFD" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LandSegmentMember" xlink:label="loc_int_LandSegmentMember_B1EF7126737C63FE1DC605BD3F09F2B4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_E473A6A2EF8C9E6E814205BD3F0954F4" xlink:to="loc_int_LandSegmentMember_B1EF7126737C63FE1DC605BD3F09F2B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccountsReceivableNetAbstract" xlink:label="loc_us-gaap_AccountsReceivableNetAbstract_305805000B74D4B8E08D05BD3F0938C6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_205CA60CB6105CC78EC605BD3F098A9D" xlink:to="loc_us-gaap_AccountsReceivableNetAbstract_305805000B74D4B8E08D05BD3F0938C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_D3CAFEC9390C88DC2D3D05BD3F092C98" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsReceivableNetAbstract_305805000B74D4B8E08D05BD3F0938C6" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_D3CAFEC9390C88DC2D3D05BD3F092C98" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_992960113E071E94C04C05BD3F099693" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsReceivableNetAbstract_305805000B74D4B8E08D05BD3F0938C6" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_992960113E071E94C04C05BD3F099693" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_GoodwillAbstract" xlink:label="loc_int_GoodwillAbstract_A9EB0CB115FF9D8C2AF105BD3F09F536" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_205CA60CB6105CC78EC605BD3F098A9D" xlink:to="loc_int_GoodwillAbstract_A9EB0CB115FF9D8C2AF105BD3F09F536" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_7AA5B2D324800B9A091B05BD3F09AF34" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_GoodwillAbstract_A9EB0CB115FF9D8C2AF105BD3F09F536" xlink:to="loc_us-gaap_Goodwill_7AA5B2D324800B9A091B05BD3F09AF34" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_9A86F3C5E3817D54FC5605BD3F096D6C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_205CA60CB6105CC78EC605BD3F098A9D" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_9A86F3C5E3817D54FC5605BD3F096D6C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1FCAC505C72D26F42A8A05BD3F0AE91F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_9A86F3C5E3817D54FC5605BD3F096D6C" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1FCAC505C72D26F42A8A05BD3F0AE91F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_2398044F69C7AFF57FA505BD3F0A9C72" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_205CA60CB6105CC78EC605BD3F098A9D" xlink:to="loc_us-gaap_AssetsAbstract_2398044F69C7AFF57FA505BD3F0A9C72" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_73B77DB5887796D2354305BD3F0AB422" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2398044F69C7AFF57FA505BD3F0A9C72" xlink:to="loc_us-gaap_Assets_73B77DB5887796D2354305BD3F0AB422" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationAndMajorCustomersGeographicSummaryDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_D6312048C952C013121232948385B251" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_668CBC71A8B3492AF38B32948383D887" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_D6312048C952C013121232948385B251" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_668CBC71A8B3492AF38B32948383D887" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="loc_us-gaap_StatementGeographicalAxis_24904D7DFCC7A70C73E832948383886B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_668CBC71A8B3492AF38B32948383D887" xlink:to="loc_us-gaap_StatementGeographicalAxis_24904D7DFCC7A70C73E832948383886B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_C0714429D024A03831E932948383A721_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementGeographicalAxis_24904D7DFCC7A70C73E832948383886B" xlink:to="loc_us-gaap_SegmentGeographicalDomain_C0714429D024A03831E932948383A721_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_C0714429D024A03831E932948383A721" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementGeographicalAxis_24904D7DFCC7A70C73E832948383886B" xlink:to="loc_us-gaap_SegmentGeographicalDomain_C0714429D024A03831E932948383A721" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_US" xlink:label="loc_country_US_B263ACB2781DCF50F0BC329483832CA3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_C0714429D024A03831E932948383A721" xlink:to="loc_country_US_B263ACB2781DCF50F0BC329483832CA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EMEAMember" xlink:label="loc_us-gaap_EMEAMember_6CE31459A6F965625B7D329483856AD7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_C0714429D024A03831E932948383A721" xlink:to="loc_us-gaap_EMEAMember_6CE31459A6F965625B7D329483856AD7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AsiaPacificMember" xlink:label="loc_us-gaap_AsiaPacificMember_E7BA88D743BD42F6E7FB329483856FAC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_C0714429D024A03831E932948383A721" xlink:to="loc_us-gaap_AsiaPacificMember_E7BA88D743BD42F6E7FB329483856FAC" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_AmericasExcludingUnitedStatesMember" xlink:label="loc_int_AmericasExcludingUnitedStatesMember_4D602CBB1CB4048A0CF3329483852411" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_C0714429D024A03831E932948383A721" xlink:to="loc_int_AmericasExcludingUnitedStatesMember_4D602CBB1CB4048A0CF3329483852411" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_GB" xlink:label="loc_country_GB_7B6526828B710AA861F432948385DEA2" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_C0714429D024A03831E932948383A721" xlink:to="loc_country_GB_7B6526828B710AA861F432948385DEA2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_SG" xlink:label="loc_country_SG_9CB454737978525B0BB232948385907F" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_C0714429D024A03831E932948383A721" xlink:to="loc_country_SG_9CB454737978525B0BB232948385907F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_6B8AEE88B83E0A9E335432948385F0AB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_D6312048C952C013121232948385B251" xlink:to="loc_us-gaap_RevenuesAbstract_6B8AEE88B83E0A9E335432948385F0AB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_E0C8F4A785CFD72170A73294838660C5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_6B8AEE88B83E0A9E335432948385F0AB" xlink:to="loc_us-gaap_Revenues_E0C8F4A785CFD72170A73294838660C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingIncomeLossAbstract" xlink:label="loc_us-gaap_OperatingIncomeLossAbstract_242DB0B19F9F2F6EBE5732948386711F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_D6312048C952C013121232948385B251" xlink:to="loc_us-gaap_OperatingIncomeLossAbstract_242DB0B19F9F2F6EBE5732948386711F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_65BACC1346217BABCF4632948386C086" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingIncomeLossAbstract_242DB0B19F9F2F6EBE5732948386711F" xlink:to="loc_us-gaap_OperatingIncomeLoss_65BACC1346217BABCF4632948386C086" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsNoncurrentAbstract" xlink:label="loc_us-gaap_AssetsNoncurrentAbstract_9EDA938ED9528D5D2DA0329483861D21" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_D6312048C952C013121232948385B251" xlink:to="loc_us-gaap_AssetsNoncurrentAbstract_9EDA938ED9528D5D2DA0329483861D21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsNoncurrent" xlink:label="loc_us-gaap_AssetsNoncurrent_C2307EFC54189903F0F632948386E0CE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_9EDA938ED9528D5D2DA0329483861D21" xlink:to="loc_us-gaap_AssetsNoncurrent_C2307EFC54189903F0F632948386E0CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_B7CF70FFA28D2DB95EA8329483867B11" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_D6312048C952C013121232948385B251" xlink:to="loc_us-gaap_AssetsAbstract_B7CF70FFA28D2DB95EA8329483867B11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_C3004C388508BB8418D332948386518A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_B7CF70FFA28D2DB95EA8329483867B11" xlink:to="loc_us-gaap_Assets_C3004C388508BB8418D332948386518A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationAndMajorCustomersIncomeStatementItemsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_12540B8AE9835D033550245EE1297A8E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_40E28ECB1F3116D473F4245EE127EB31" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_12540B8AE9835D033550245EE1297A8E" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_40E28ECB1F3116D473F4245EE127EB31" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="loc_us-gaap_ConsolidationItemsAxis_A42E5DFD161E1C59BC19245EE127381E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_40E28ECB1F3116D473F4245EE127EB31" xlink:to="loc_us-gaap_ConsolidationItemsAxis_A42E5DFD161E1C59BC19245EE127381E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_6387FC277745783BD003245EE128D17A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConsolidationItemsAxis_A42E5DFD161E1C59BC19245EE127381E" xlink:to="loc_us-gaap_ConsolidationItemsDomain_6387FC277745783BD003245EE128D17A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_6387FC277745783BD003245EE128D17A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConsolidationItemsAxis_A42E5DFD161E1C59BC19245EE127381E" xlink:to="loc_us-gaap_ConsolidationItemsDomain_6387FC277745783BD003245EE128D17A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_9061BAE3E64DD7F0EBA9245EE128754E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConsolidationItemsDomain_6387FC277745783BD003245EE128D17A" xlink:to="loc_us-gaap_OperatingSegmentsMember_9061BAE3E64DD7F0EBA9245EE128754E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_782FDAE7D6D46D50CD6A245EE12843D0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConsolidationItemsDomain_6387FC277745783BD003245EE128D17A" xlink:to="loc_us-gaap_CorporateNonSegmentMember_782FDAE7D6D46D50CD6A245EE12843D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_EE95635CB19C80A5A99B245EE129D752" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_40E28ECB1F3116D473F4245EE127EB31" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_EE95635CB19C80A5A99B245EE129D752" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_AC8084E34C59A42B9F70245EE129AC62_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_EE95635CB19C80A5A99B245EE129D752" xlink:to="loc_us-gaap_SegmentDomain_AC8084E34C59A42B9F70245EE129AC62_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_AC8084E34C59A42B9F70245EE129AC62" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_EE95635CB19C80A5A99B245EE129D752" xlink:to="loc_us-gaap_SegmentDomain_AC8084E34C59A42B9F70245EE129AC62" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_AviationSegmentMember" xlink:label="loc_int_AviationSegmentMember_BC0DE4BE47939B149790245EE1295849" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_AC8084E34C59A42B9F70245EE129AC62" xlink:to="loc_int_AviationSegmentMember_BC0DE4BE47939B149790245EE1295849" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_MarineSegmentMember" xlink:label="loc_int_MarineSegmentMember_7C8E69ADE00F49921BCC245EE129DB9F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_AC8084E34C59A42B9F70245EE129AC62" xlink:to="loc_int_MarineSegmentMember_7C8E69ADE00F49921BCC245EE129DB9F" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LandSegmentMember" xlink:label="loc_int_LandSegmentMember_BCA430EB165DCCA960A5245EE1290298" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_AC8084E34C59A42B9F70245EE129AC62" xlink:to="loc_int_LandSegmentMember_BCA430EB165DCCA960A5245EE1290298" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_06A4A61238B5EB91FEB1245EE129E78E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_12540B8AE9835D033550245EE1297A8E" xlink:to="loc_us-gaap_NumberOfReportableSegments_06A4A61238B5EB91FEB1245EE129E78E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_E4609E6622BFCAF6A251245EE1291BDB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_12540B8AE9835D033550245EE1297A8E" xlink:to="loc_us-gaap_RevenuesAbstract_E4609E6622BFCAF6A251245EE1291BDB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_C29B996D6F53E3016ACC245EE129FEF7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_E4609E6622BFCAF6A251245EE1291BDB" xlink:to="loc_us-gaap_Revenues_C29B996D6F53E3016ACC245EE129FEF7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GrossProfitAbstract" xlink:label="loc_us-gaap_GrossProfitAbstract_CCD8C9F46560088112D9245EE129EDBB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_12540B8AE9835D033550245EE1297A8E" xlink:to="loc_us-gaap_GrossProfitAbstract_CCD8C9F46560088112D9245EE129EDBB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_71F3D53A9FEC5DEAF9F7245EE12A6F38" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GrossProfitAbstract_CCD8C9F46560088112D9245EE129EDBB" xlink:to="loc_us-gaap_GrossProfit_71F3D53A9FEC5DEAF9F7245EE12A6F38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingIncomeLossAbstract" xlink:label="loc_us-gaap_OperatingIncomeLossAbstract_D71F00C772F1240FD22A245EE12A7FAF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_12540B8AE9835D033550245EE1297A8E" xlink:to="loc_us-gaap_OperatingIncomeLossAbstract_D71F00C772F1240FD22A245EE12A7FAF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_8702DBDE09D90D99AE97245EE12AB874" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingIncomeLossAbstract_D71F00C772F1240FD22A245EE12A7FAF" xlink:to="loc_us-gaap_OperatingIncomeLoss_8702DBDE09D90D99AE97245EE12AB874" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DepreciationAndAmortizationAbstract" xlink:label="loc_us-gaap_DepreciationAndAmortizationAbstract_FAECF334C11BC54D58D1245EE12A9C90" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_12540B8AE9835D033550245EE1297A8E" xlink:to="loc_us-gaap_DepreciationAndAmortizationAbstract_FAECF334C11BC54D58D1245EE12A9C90" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_98CCF08628848305586A245EE12A3DB7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DepreciationAndAmortizationAbstract_FAECF334C11BC54D58D1245EE12A9C90" xlink:to="loc_us-gaap_DepreciationAndAmortization_98CCF08628848305586A245EE12A3DB7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentReportingInformationAdditionalInformationAbstract" xlink:label="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_993D6F5007CA77F8F3FD245EE12A4980" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_12540B8AE9835D033550245EE1297A8E" xlink:to="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_993D6F5007CA77F8F3FD245EE12A4980" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_CapitalExpenditures" xlink:label="loc_int_CapitalExpenditures_B695E8416B4094697C06245EE12A0819" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_993D6F5007CA77F8F3FD245EE12A4980" xlink:to="loc_int_CapitalExpenditures_B695E8416B4094697C06245EE12A0819" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationAndMajorCustomersTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/CommitmentsAndContingenciesBondsLeasesAndSalesAndPurchaseCommitmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermPurchaseCommitmentLineItems" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentLineItems_3BFDE4F64CCBADB1097943B828C9F8F1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermPurchaseCommitmentTable" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentTable_C9843C60272989925B6E43B828C8C883" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_3BFDE4F64CCBADB1097943B828C9F8F1" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentTable_C9843C60272989925B6E43B828C8C883" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_79C83AD5B65F2914738D43B828C8F790" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_C9843C60272989925B6E43B828C8C883" xlink:to="loc_us-gaap_RangeAxis_79C83AD5B65F2914738D43B828C8F790" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_98BFEF43A827BED08E6243B828C9E434_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_79C83AD5B65F2914738D43B828C8F790" xlink:to="loc_us-gaap_RangeMember_98BFEF43A827BED08E6243B828C9E434_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_98BFEF43A827BED08E6243B828C9E434" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_79C83AD5B65F2914738D43B828C8F790" xlink:to="loc_us-gaap_RangeMember_98BFEF43A827BED08E6243B828C9E434" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_DFD2F4A53EA91D6C379643B828C906AF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_98BFEF43A827BED08E6243B828C9E434" xlink:to="loc_us-gaap_MinimumMember_DFD2F4A53EA91D6C379643B828C906AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_F83B6BD957B64ED102B443B828C9B64F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_98BFEF43A827BED08E6243B828C9E434" xlink:to="loc_us-gaap_MaximumMember_F83B6BD957B64ED102B443B828C9B64F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_59CCFAC15620EBA2125943B828C9DA37" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_C9843C60272989925B6E43B828C8C883" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_59CCFAC15620EBA2125943B828C9DA37" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_4AA6CF8F610D0D37E31943B828C93BC2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_59CCFAC15620EBA2125943B828C9DA37" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_4AA6CF8F610D0D37E31943B828C93BC2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_4AA6CF8F610D0D37E31943B828C93BC2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_59CCFAC15620EBA2125943B828C9DA37" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_4AA6CF8F610D0D37E31943B828C93BC2" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_AviationFuelMember" xlink:label="loc_int_AviationFuelMember_2B472F7712400F3DD6AD43B828C9F695" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_4AA6CF8F610D0D37E31943B828C93BC2" xlink:to="loc_int_AviationFuelMember_2B472F7712400F3DD6AD43B828C9F695" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired_BE6DDE83753865BD6F8843B828C99E2D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_3BFDE4F64CCBADB1097943B828C9F8F1" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired_BE6DDE83753865BD6F8843B828C99E2D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermPurchaseCommitmentPeriod" xlink:label="loc_us-gaap_LongtermPurchaseCommitmentPeriod_4DE645EC3AFC7F46C1D043B828C9941B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_3BFDE4F64CCBADB1097943B828C9F8F1" xlink:to="loc_us-gaap_LongtermPurchaseCommitmentPeriod_4DE645EC3AFC7F46C1D043B828C9941B" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LongTermPurchaseCommitmentRenewalOptionPeriod" xlink:label="loc_int_LongTermPurchaseCommitmentRenewalOptionPeriod_1D188654284D033485A343B828CA5595" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_3BFDE4F64CCBADB1097943B828C9F8F1" xlink:to="loc_int_LongTermPurchaseCommitmentRenewalOptionPeriod_1D188654284D033485A343B828CA5595" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/CommitmentsAndContingenciesDeferredCompensationDetails" xlink:type="extended">
    <link:loc xlink:href="int-20161130.xsd#int_DefinedContributionPlansLineItems" xlink:label="loc_int_DefinedContributionPlansLineItems_32E1E0DD72B6BD326993439942226F88" xlink:type="locator" />
    <link:loc xlink:href="int-20161130.xsd#int_ScheduleOfDefinedContributionPlansDisclosuresTable" xlink:label="loc_int_ScheduleOfDefinedContributionPlansDisclosuresTable_AF3251AF71986CA85A2443994221AAEC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_int_DefinedContributionPlansLineItems_32E1E0DD72B6BD326993439942226F88" xlink:to="loc_int_ScheduleOfDefinedContributionPlansDisclosuresTable_AF3251AF71986CA85A2443994221AAEC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_AE365DA9E55129E020094399422199D7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_int_ScheduleOfDefinedContributionPlansDisclosuresTable_AF3251AF71986CA85A2443994221AAEC" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_AE365DA9E55129E020094399422199D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain" xlink:label="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_65DE5CE807E00ED2BBA94399422297A8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_AE365DA9E55129E020094399422199D7" xlink:to="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_65DE5CE807E00ED2BBA94399422297A8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain" xlink:label="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_65DE5CE807E00ED2BBA94399422297A8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_AE365DA9E55129E020094399422199D7" xlink:to="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_65DE5CE807E00ED2BBA94399422297A8" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_UnitedStatesDefinedContributionPlansMember" xlink:label="loc_int_UnitedStatesDefinedContributionPlansMember_E7C4E15CFEC418DDF9A843994222C819" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_65DE5CE807E00ED2BBA94399422297A8" xlink:to="loc_int_UnitedStatesDefinedContributionPlansMember_E7C4E15CFEC418DDF9A843994222C819" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_NonqualifiedDeferredCompensationPlanMember" xlink:label="loc_int_NonqualifiedDeferredCompensationPlanMember_AC6C74BBA140B16604A8439942228049" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_65DE5CE807E00ED2BBA94399422297A8" xlink:to="loc_int_NonqualifiedDeferredCompensationPlanMember_AC6C74BBA140B16604A8439942228049" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_E89E596EB565B244518E4399422237E6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_int_ScheduleOfDefinedContributionPlansDisclosuresTable_AF3251AF71986CA85A2443994221AAEC" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_E89E596EB565B244518E4399422237E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_24948B6B553DB1AE98D343994222961D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_E89E596EB565B244518E4399422237E6" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_24948B6B553DB1AE98D343994222961D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_24948B6B553DB1AE98D343994222961D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_E89E596EB565B244518E4399422237E6" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_24948B6B553DB1AE98D343994222961D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_A40EE268EC4F8920603643994222AC1E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_24948B6B553DB1AE98D343994222961D" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_A40EE268EC4F8920603643994222AC1E" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_DefinedContributionPlanEmployerMatch" xlink:label="loc_int_DefinedContributionPlanEmployerMatch_6A730BBB52DF0558A8C74399422354A2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_DefinedContributionPlansLineItems_32E1E0DD72B6BD326993439942226F88" xlink:to="loc_int_DefinedContributionPlanEmployerMatch_6A730BBB52DF0558A8C74399422354A2" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne" xlink:label="loc_int_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne_D277C464C83FEAB3467C439942232B1C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_DefinedContributionPlansLineItems_32E1E0DD72B6BD326993439942226F88" xlink:to="loc_int_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne_D277C464C83FEAB3467C439942232B1C" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_DefinedContributionPlanEmployerContributionLimitPercentageOfCompensation" xlink:label="loc_int_DefinedContributionPlanEmployerContributionLimitPercentageOfCompensation_6F0CEDC3A3DEB6443E9343994223E054" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_DefinedContributionPlansLineItems_32E1E0DD72B6BD326993439942226F88" xlink:to="loc_int_DefinedContributionPlanEmployerContributionLimitPercentageOfCompensation_6F0CEDC3A3DEB6443E9343994223E054" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_AD912D2D471BC137786543994223DD58" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_DefinedContributionPlansLineItems_32E1E0DD72B6BD326993439942226F88" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_AD912D2D471BC137786543994223DD58" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/CommitmentsAndContingenciesEmploymentAgreementsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_F01389FC50F6AC5C67494399423AEF4F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_284462D215906201B49243994239B18A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_F01389FC50F6AC5C67494399423AEF4F" xlink:to="loc_us-gaap_LossContingenciesTable_284462D215906201B49243994239B18A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_98ABD957562A7D13A17B43994239B367" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_284462D215906201B49243994239B18A" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_98ABD957562A7D13A17B43994239B367" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_76B6B339AAE5D8EA0628439942395A7C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_98ABD957562A7D13A17B43994239B367" xlink:to="loc_us-gaap_LossContingencyNatureDomain_76B6B339AAE5D8EA0628439942395A7C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_76B6B339AAE5D8EA0628439942395A7C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_98ABD957562A7D13A17B43994239B367" xlink:to="loc_us-gaap_LossContingencyNatureDomain_76B6B339AAE5D8EA0628439942395A7C" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_KasbarAgreementMember" xlink:label="loc_int_KasbarAgreementMember_19CB1B904F67D0857D9D4399423A773A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_76B6B339AAE5D8EA0628439942395A7C" xlink:to="loc_int_KasbarAgreementMember_19CB1B904F67D0857D9D4399423A773A" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember" xlink:label="loc_int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember_264E78D8B2C98EFA54D24399423A9DDC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_76B6B339AAE5D8EA0628439942395A7C" xlink:to="loc_int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember_264E78D8B2C98EFA54D24399423A9DDC" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LossContingencyAnnualBaseSalaryUnderAgreement" xlink:label="loc_int_LossContingencyAnnualBaseSalaryUnderAgreement_53B8B995002B9FFA15FF4399423A491E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F01389FC50F6AC5C67494399423AEF4F" xlink:to="loc_int_LossContingencyAnnualBaseSalaryUnderAgreement_53B8B995002B9FFA15FF4399423A491E" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LossContingencyAgreementExpirationTermExtensionUnderSpecifiedCondition" xlink:label="loc_int_LossContingencyAgreementExpirationTermExtensionUnderSpecifiedCondition_B7B91A6AE1A94CCE97294399423A6AC0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F01389FC50F6AC5C67494399423AEF4F" xlink:to="loc_int_LossContingencyAgreementExpirationTermExtensionUnderSpecifiedCondition_B7B91A6AE1A94CCE97294399423A6AC0" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm" xlink:label="loc_int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm_516C95C35A83C825CEC14399423A62C2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F01389FC50F6AC5C67494399423AEF4F" xlink:to="loc_int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm_516C95C35A83C825CEC14399423A62C2" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl" xlink:label="loc_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl_F4C353D2AF693A7A159E4399423A891A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F01389FC50F6AC5C67494399423AEF4F" xlink:to="loc_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl_F4C353D2AF693A7A159E4399423A891A" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios" xlink:label="loc_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios_1A2C5769749BD445AC984399423ADEDC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F01389FC50F6AC5C67494399423AEF4F" xlink:to="loc_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios_1A2C5769749BD445AC984399423ADEDC" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment" xlink:label="loc_int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment_141821FE34CECBF8C9674399423A64B2" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F01389FC50F6AC5C67494399423AEF4F" xlink:to="loc_int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment_141821FE34CECBF8C9674399423A64B2" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract" xlink:label="loc_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1FD6CE838737CFF904324399423A487F" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F01389FC50F6AC5C67494399423AEF4F" xlink:to="loc_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1FD6CE838737CFF904324399423A487F" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne" xlink:label="loc_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne_4B9B816A0CA83DBDA3584399423B4D76" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1FD6CE838737CFF904324399423A487F" xlink:to="loc_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne_4B9B816A0CA83DBDA3584399423B4D76" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ExecutiveNonRenewalChargeAbstract" xlink:label="loc_int_ExecutiveNonRenewalChargeAbstract_A8FAC3A29A2DA624867B4399423B4545" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F01389FC50F6AC5C67494399423AEF4F" xlink:to="loc_int_ExecutiveNonRenewalChargeAbstract_A8FAC3A29A2DA624867B4399423B4545" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_SeveranceTerminationCosts" xlink:label="loc_int_SeveranceTerminationCosts_5296384ADEC3365FE5194399423B8A8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ExecutiveNonRenewalChargeAbstract_A8FAC3A29A2DA624867B4399423B4545" xlink:to="loc_int_SeveranceTerminationCosts_5296384ADEC3365FE5194399423B8A8B" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_SeveranceCostsNonCash" xlink:label="loc_int_SeveranceCostsNonCash_B887565943A1A601E6494399423B5250" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ExecutiveNonRenewalChargeAbstract_A8FAC3A29A2DA624867B4399423B4545" xlink:to="loc_int_SeveranceCostsNonCash_B887565943A1A601E6494399423B5250" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/CommitmentsAndContingenciesLegalTaxAndOtherMattersDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_22F94CB457FB44163F5D439942114105" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_CE89B88E7BE6A40719914399420F5814" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_22F94CB457FB44163F5D439942114105" xlink:to="loc_us-gaap_LossContingenciesTable_CE89B88E7BE6A40719914399420F5814" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LitigationCaseAxis" xlink:label="loc_us-gaap_LitigationCaseAxis_9B90835F3137584B0D354399421081DB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_CE89B88E7BE6A40719914399420F5814" xlink:to="loc_us-gaap_LitigationCaseAxis_9B90835F3137584B0D354399421081DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LitigationCaseTypeDomain" xlink:label="loc_us-gaap_LitigationCaseTypeDomain_B634CDBC5B57E5B2A5AE439942107BD7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationCaseAxis_9B90835F3137584B0D354399421081DB" xlink:to="loc_us-gaap_LitigationCaseTypeDomain_B634CDBC5B57E5B2A5AE439942107BD7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LitigationCaseTypeDomain" xlink:label="loc_us-gaap_LitigationCaseTypeDomain_B634CDBC5B57E5B2A5AE439942107BD7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationCaseAxis_9B90835F3137584B0D354399421081DB" xlink:to="loc_us-gaap_LitigationCaseTypeDomain_B634CDBC5B57E5B2A5AE439942107BD7" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_AGCSMarineInsuranceCompanyMember" xlink:label="loc_int_AGCSMarineInsuranceCompanyMember_7F79D4E48DA6FA72A1B243994210C828" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationCaseTypeDomain_B634CDBC5B57E5B2A5AE439942107BD7" xlink:to="loc_int_AGCSMarineInsuranceCompanyMember_7F79D4E48DA6FA72A1B243994210C828" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LitigationStatusAxis" xlink:label="loc_us-gaap_LitigationStatusAxis_21EA2FC37E776823A2834399421088B0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_CE89B88E7BE6A40719914399420F5814" xlink:to="loc_us-gaap_LitigationStatusAxis_21EA2FC37E776823A2834399421088B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LitigationStatusDomain" xlink:label="loc_us-gaap_LitigationStatusDomain_3D4AFA41E39D220149AA43994210E095_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_21EA2FC37E776823A2834399421088B0" xlink:to="loc_us-gaap_LitigationStatusDomain_3D4AFA41E39D220149AA43994210E095_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LitigationStatusDomain" xlink:label="loc_us-gaap_LitigationStatusDomain_3D4AFA41E39D220149AA43994210E095" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_21EA2FC37E776823A2834399421088B0" xlink:to="loc_us-gaap_LitigationStatusDomain_3D4AFA41E39D220149AA43994210E095" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_JudicialRulingMember" xlink:label="loc_us-gaap_JudicialRulingMember_6BAF210A9384FB3BB91543994210707C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_3D4AFA41E39D220149AA43994210E095" xlink:to="loc_us-gaap_JudicialRulingMember_6BAF210A9384FB3BB91543994210707C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_878598BC6D27191C3CA443994210DDAA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_CE89B88E7BE6A40719914399420F5814" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_878598BC6D27191C3CA443994210DDAA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_35516D3EAA4101323CB44399421018A0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_878598BC6D27191C3CA443994210DDAA" xlink:to="loc_us-gaap_LossContingencyNatureDomain_35516D3EAA4101323CB44399421018A0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_35516D3EAA4101323CB44399421018A0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_878598BC6D27191C3CA443994210DDAA" xlink:to="loc_us-gaap_LossContingencyNatureDomain_35516D3EAA4101323CB44399421018A0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InsuranceClaimsMember" xlink:label="loc_us-gaap_InsuranceClaimsMember_C102B85E24B2A0DD38CB439942100962" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_35516D3EAA4101323CB44399421018A0" xlink:to="loc_us-gaap_InsuranceClaimsMember_C102B85E24B2A0DD38CB439942100962" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_TaxAuthorityAssessmentMember" xlink:label="loc_int_TaxAuthorityAssessmentMember_943445CE02EFE135D9D143994210604E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_35516D3EAA4101323CB44399421018A0" xlink:to="loc_int_TaxAuthorityAssessmentMember_943445CE02EFE135D9D143994210604E" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_TaxAuthorityPreAssessmentMember" xlink:label="loc_int_TaxAuthorityPreAssessmentMember_4135844D1B9C4FE7684A43994211A7D0" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_35516D3EAA4101323CB44399421018A0" xlink:to="loc_int_TaxAuthorityPreAssessmentMember_4135844D1B9C4FE7684A43994211A7D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CollectibilityOfReceivablesMember" xlink:label="loc_us-gaap_CollectibilityOfReceivablesMember_8BDAF83206FEF46C0150439942118B8C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_35516D3EAA4101323CB44399421018A0" xlink:to="loc_us-gaap_CollectibilityOfReceivablesMember_8BDAF83206FEF46C0150439942118B8C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MajorCustomersAxis" xlink:label="loc_us-gaap_MajorCustomersAxis_14CB61D01DDBB1DF9BF6439942119CE1" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_CE89B88E7BE6A40719914399420F5814" xlink:to="loc_us-gaap_MajorCustomersAxis_14CB61D01DDBB1DF9BF6439942119CE1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NameOfMajorCustomerDomain" xlink:label="loc_us-gaap_NameOfMajorCustomerDomain_D6D2BC22D155F1C8824943994211F201_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorCustomersAxis_14CB61D01DDBB1DF9BF6439942119CE1" xlink:to="loc_us-gaap_NameOfMajorCustomerDomain_D6D2BC22D155F1C8824943994211F201_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NameOfMajorCustomerDomain" xlink:label="loc_us-gaap_NameOfMajorCustomerDomain_D6D2BC22D155F1C8824943994211F201" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorCustomersAxis_14CB61D01DDBB1DF9BF6439942119CE1" xlink:to="loc_us-gaap_NameOfMajorCustomerDomain_D6D2BC22D155F1C8824943994211F201" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_HanjinShippingCo.Ltd.Member" xlink:label="loc_int_HanjinShippingCo.Ltd.Member_396E98CE9494021EAD2A439942112D3A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NameOfMajorCustomerDomain_D6D2BC22D155F1C8824943994211F201" xlink:to="loc_int_HanjinShippingCo.Ltd.Member_396E98CE9494021EAD2A439942112D3A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_A3F90626EFF236B4EB6D439942113661" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_22F94CB457FB44163F5D439942114105" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_A3F90626EFF236B4EB6D439942113661" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingencyDamagesAwardedValue" xlink:label="loc_us-gaap_LossContingencyDamagesAwardedValue_A690DA12251B24D0484643994211DCE6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_22F94CB457FB44163F5D439942114105" xlink:to="loc_us-gaap_LossContingencyDamagesAwardedValue_A690DA12251B24D0484643994211DCE6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingencyLossInPeriod" xlink:label="loc_us-gaap_LossContingencyLossInPeriod_13F80E30D8425B48803B43994211971A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_22F94CB457FB44163F5D439942114105" xlink:to="loc_us-gaap_LossContingencyLossInPeriod_13F80E30D8425B48803B43994211971A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingencyReceivable" xlink:label="loc_us-gaap_LossContingencyReceivable_71C6E616CD19A42EBB6243994211A982" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_22F94CB457FB44163F5D439942114105" xlink:to="loc_us-gaap_LossContingencyReceivable_71C6E616CD19A42EBB6243994211A982" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/CommitmentsAndContingenciesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ConsolidatedBalanceSheets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsOfCashFlowsParenthetical" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_6A0A5558E5F5AC1024C41A8DFBED0046" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_9AB62F4E512ED5F62E4F1A8DFBEC6C03" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_6A0A5558E5F5AC1024C41A8DFBED0046" xlink:to="loc_us-gaap_StatementTable_9AB62F4E512ED5F62E4F1A8DFBEC6C03" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_D0AA72EA5FDD498370E11A8DFBEC12DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_9AB62F4E512ED5F62E4F1A8DFBEC6C03" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_D0AA72EA5FDD498370E11A8DFBEC12DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C6156EFC3078B8EAE2CD1A8DFBEC1AAA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_D0AA72EA5FDD498370E11A8DFBEC12DF" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C6156EFC3078B8EAE2CD1A8DFBEC1AAA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C6156EFC3078B8EAE2CD1A8DFBEC1AAA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_D0AA72EA5FDD498370E11A8DFBEC12DF" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C6156EFC3078B8EAE2CD1A8DFBEC1AAA" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_TobrasMember" xlink:label="loc_int_TobrasMember_AD9BA73118644CC34A4B1A8DFBECC838" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C6156EFC3078B8EAE2CD1A8DFBEC1AAA" xlink:to="loc_int_TobrasMember_AD9BA73118644CC34A4B1A8DFBECC838" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_37488D6B9532864C02F51A8DFBED84BA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_9AB62F4E512ED5F62E4F1A8DFBEC6C03" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_37488D6B9532864C02F51A8DFBED84BA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_B76A95BDA144810206681A8DFBED0A98_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_37488D6B9532864C02F51A8DFBED84BA" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_B76A95BDA144810206681A8DFBED0A98_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_B76A95BDA144810206681A8DFBED0A98" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_37488D6B9532864C02F51A8DFBED84BA" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_B76A95BDA144810206681A8DFBED0A98" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_9276FA80318AE593D3FA1A8DFBED9BE0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_B76A95BDA144810206681A8DFBED0A98" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_9276FA80318AE593D3FA1A8DFBED9BE0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_E448DBD50A06FBF4536E1A8DFBEDB655" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_6A0A5558E5F5AC1024C41A8DFBED0046" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_E448DBD50A06FBF4536E1A8DFBEDB655" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_1DD6A35C1ED4DC763C6C1A8DFBED725C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_E448DBD50A06FBF4536E1A8DFBEDB655" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_1DD6A35C1ED4DC763C6C1A8DFBED725C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_21909989FB7DA0EB259F1A8DFBEDACCB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_E448DBD50A06FBF4536E1A8DFBEDB655" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_21909989FB7DA0EB259F1A8DFBEDACCB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_1C933B53D1C67511A0A91A8DFBEDF487" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_E448DBD50A06FBF4536E1A8DFBEDB655" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_1C933B53D1C67511A0A91A8DFBEDF487" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NotesAssumed1" xlink:label="loc_us-gaap_NotesAssumed1_67E43B280F6D3BB99A961A8DFBED08C5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_E448DBD50A06FBF4536E1A8DFBEDB655" xlink:to="loc_us-gaap_NotesAssumed1_67E43B280F6D3BB99A961A8DFBED08C5" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_NumberOfPromissoryNotesSettledWithAcquisition" xlink:label="loc_int_NumberOfPromissoryNotesSettledWithAcquisition_DF3E384C7F76EEB11E671A8DFBEDDA9E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_E448DBD50A06FBF4536E1A8DFBEDB655" xlink:to="loc_int_NumberOfPromissoryNotesSettledWithAcquisition_DF3E384C7F76EEB11E671A8DFBEDDA9E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DecreaseInRestrictedCash" xlink:label="loc_us-gaap_DecreaseInRestrictedCash_B1D1EF62ED4AD993E1981A8DFBEDACB7" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_E448DBD50A06FBF4536E1A8DFBEDB655" xlink:to="loc_us-gaap_DecreaseInRestrictedCash_B1D1EF62ED4AD993E1981A8DFBEDACB7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalents" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_35D58CF719B8909A4CF11A8DFBED8451" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_E448DBD50A06FBF4536E1A8DFBEDB655" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_35D58CF719B8909A4CF11A8DFBED8451" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueOfAssetsAcquired" xlink:label="loc_us-gaap_FairValueOfAssetsAcquired_334E10972E4695809FBB1A8DFBEE1F12" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_E448DBD50A06FBF4536E1A8DFBEDB655" xlink:to="loc_us-gaap_FairValueOfAssetsAcquired_334E10972E4695809FBB1A8DFBEE1F12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesAssumed1" xlink:label="loc_us-gaap_LiabilitiesAssumed1_770BEF0406E49FAE70BB1A8DFBEE90A4" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_E448DBD50A06FBF4536E1A8DFBEDB655" xlink:to="loc_us-gaap_LiabilitiesAssumed1_770BEF0406E49FAE70BB1A8DFBEE90A4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncomeParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsOfShareholdersEquity" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_221495AC0FDB7DDA84343961B948A7A3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_6B28FEFB955C18C033313961B947C854" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_221495AC0FDB7DDA84343961B948A7A3" xlink:to="loc_us-gaap_StatementTable_6B28FEFB955C18C033313961B947C854" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_0F35A969C68E2C176BC93961B9475AD4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_6B28FEFB955C18C033313961B947C854" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_0F35A969C68E2C176BC93961B9475AD4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_290A85746903FA0C549C3961B9484889_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_0F35A969C68E2C176BC93961B9475AD4" xlink:to="loc_us-gaap_EquityComponentDomain_290A85746903FA0C549C3961B9484889_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_290A85746903FA0C549C3961B9484889" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_0F35A969C68E2C176BC93961B9475AD4" xlink:to="loc_us-gaap_EquityComponentDomain_290A85746903FA0C549C3961B9484889" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_E924944C7DA5F8D8EADA3961B948AAF1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_290A85746903FA0C549C3961B9484889" xlink:to="loc_us-gaap_CommonStockMember_E924944C7DA5F8D8EADA3961B948AAF1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_6000C7691840FFB3D2C13961B948CDEA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_290A85746903FA0C549C3961B9484889" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_6000C7691840FFB3D2C13961B948CDEA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_620FBD7C00529C11CFD03961B9484A91" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_290A85746903FA0C549C3961B9484889" xlink:to="loc_us-gaap_RetainedEarningsMember_620FBD7C00529C11CFD03961B9484A91" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_F8BA43C5235D711BAD893961B9486461" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_290A85746903FA0C549C3961B9484889" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_F8BA43C5235D711BAD893961B9486461" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_F621E4942FFF8AC821253961B9489035" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_290A85746903FA0C549C3961B9484889" xlink:to="loc_us-gaap_ParentMember_F621E4942FFF8AC821253961B9489035" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_8078A98F32A6C099DBB83961B94885FF" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_290A85746903FA0C549C3961B9484889" xlink:to="loc_us-gaap_NoncontrollingInterestMember_8078A98F32A6C099DBB83961B94885FF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_221495AC0FDB7DDA84343961B948A7A3" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_17EB6C735D043345D6363961B94863A1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_17EB6C735D043345D6363961B94863A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_DF7198CD556674144BD93961B9488DE5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_CommonStockSharesIssued_DF7198CD556674144BD93961B9488DE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_E826569A171C78A44C423961B948305C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_ProfitLoss_E826569A171C78A44C423961B948305C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DividendsCash" xlink:label="loc_us-gaap_DividendsCash_CF60786D1473C2B284E23961B94830FD" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_DividendsCash_CF60786D1473C2B284E23961B94830FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_606206251D716300A3A13961B9480E16" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_606206251D716300A3A13961B9480E16" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest_A76C54F2F3F0B1EA89B03961B94953BD" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest_A76C54F2F3F0B1EA89B03961B94953BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_8CC36BD8D8EAC3C630B23961B949191C" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_8CC36BD8D8EAC3C630B23961B949191C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_5182C7C96181772FE2DB3961B949F812" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_5182C7C96181772FE2DB3961B949F812" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_0EE8E4EC6B1FBD3A4F5D3961B9492595" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_0EE8E4EC6B1FBD3A4F5D3961B9492595" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_F0F0E3E7A2A4734357AE3961B9496906" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_F0F0E3E7A2A4734357AE3961B9496906" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareRepurchasesRelatedToEmployeeStockBasedCompensationAwardsValue" xlink:label="loc_int_ShareRepurchasesRelatedToEmployeeStockBasedCompensationAwardsValue_3C99BBC9404D4247C4153961B9498EEC" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_int_ShareRepurchasesRelatedToEmployeeStockBasedCompensationAwardsValue_3C99BBC9404D4247C4153961B9498EEC" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareRepurchasesRelatedToEmployeeStockBasedCompensationAwardsShares" xlink:label="loc_int_ShareRepurchasesRelatedToEmployeeStockBasedCompensationAwardsShares_D4A7050CE19058DA41503961B949FC0A" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_int_ShareRepurchasesRelatedToEmployeeStockBasedCompensationAwardsShares_D4A7050CE19058DA41503961B949FC0A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_A829F91FCD01CC6A5BAE3961B94917CF" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_A829F91FCD01CC6A5BAE3961B94917CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_5BB77E89C046632FE7FC3961B9490DBA" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_5BB77E89C046632FE7FC3961B9490DBA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_D17AC3374754A7AA11C33961B949014C" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_D17AC3374754A7AA11C33961B949014C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_716DA58D508A07279AB63961B949673A" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_716DA58D508A07279AB63961B949673A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_5261F66609D1B4C96E483961B9493A50" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_DD1BE9CC4B4119E40CC73961B948BA87" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_5261F66609D1B4C96E483961B9493A50" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsOfShareholdersEquityParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/CorrectionOfPreviouslyIssuedFinancialInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/CorrectionOfPreviouslyIssuedFinancialInformationConsolidatedBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_4EDD3B667B8103D919163D6E6A97F2B1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_B65D42B9B91610849EDF3D6E6A9651C0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4EDD3B667B8103D919163D6E6A97F2B1" xlink:to="loc_us-gaap_StatementTable_B65D42B9B91610849EDF3D6E6A9651C0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_CE21B702ED9234FF7CA23D6E6A96D875" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_B65D42B9B91610849EDF3D6E6A9651C0" xlink:to="loc_us-gaap_StatementScenarioAxis_CE21B702ED9234FF7CA23D6E6A96D875" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_564A4E6C10FA4CD0F5FA3D6E6A96EB11_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_CE21B702ED9234FF7CA23D6E6A96D875" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_564A4E6C10FA4CD0F5FA3D6E6A96EB11_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_564A4E6C10FA4CD0F5FA3D6E6A96EB11" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_CE21B702ED9234FF7CA23D6E6A96D875" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_564A4E6C10FA4CD0F5FA3D6E6A96EB11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScenarioPreviouslyReportedMember" xlink:label="loc_us-gaap_ScenarioPreviouslyReportedMember_55076C64285D2756AB623D6E6A969EA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_564A4E6C10FA4CD0F5FA3D6E6A96EB11" xlink:to="loc_us-gaap_ScenarioPreviouslyReportedMember_55076C64285D2756AB623D6E6A969EA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestatementAdjustmentMember" xlink:label="loc_us-gaap_RestatementAdjustmentMember_0E46E625F2E18FA21FA43D6E6A968308" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_564A4E6C10FA4CD0F5FA3D6E6A96EB11" xlink:to="loc_us-gaap_RestatementAdjustmentMember_0E46E625F2E18FA21FA43D6E6A968308" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis" xlink:label="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis_B98D327D67800331ADD33D6E6A9666B0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_B65D42B9B91610849EDF3D6E6A9651C0" xlink:to="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis_B98D327D67800331ADD33D6E6A9666B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NatureOfErrorDomain" xlink:label="loc_us-gaap_NatureOfErrorDomain_7F3EA9CEC53A710999AA3D6E6A965DC4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis_B98D327D67800331ADD33D6E6A9666B0" xlink:to="loc_us-gaap_NatureOfErrorDomain_7F3EA9CEC53A710999AA3D6E6A965DC4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NatureOfErrorDomain" xlink:label="loc_us-gaap_NatureOfErrorDomain_7F3EA9CEC53A710999AA3D6E6A965DC4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis_B98D327D67800331ADD33D6E6A9666B0" xlink:to="loc_us-gaap_NatureOfErrorDomain_7F3EA9CEC53A710999AA3D6E6A965DC4" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_CorrectionToProvisionForIncomeTaxesMember" xlink:label="loc_int_CorrectionToProvisionForIncomeTaxesMember_884930068BB7839B80853D6E6A9644A8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NatureOfErrorDomain_7F3EA9CEC53A710999AA3D6E6A965DC4" xlink:to="loc_int_CorrectionToProvisionForIncomeTaxesMember_884930068BB7839B80853D6E6A9644A8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_8047164DE7848AA68DBF3D6E6A973078" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4EDD3B667B8103D919163D6E6A97F2B1" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_8047164DE7848AA68DBF3D6E6A973078" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_A322D29C0009B46A3A553D6E6A9702AA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4EDD3B667B8103D919163D6E6A97F2B1" xlink:to="loc_us-gaap_AssetsAbstract_A322D29C0009B46A3A553D6E6A9702AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_E0EC8D0BC6FA9354C1063D6E6A973BF4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A322D29C0009B46A3A553D6E6A9702AA" xlink:to="loc_us-gaap_AssetsCurrentAbstract_E0EC8D0BC6FA9354C1063D6E6A973BF4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_F6BE1D80CA20962AE71E3D6E6A9774E9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_E0EC8D0BC6FA9354C1063D6E6A973BF4" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_F6BE1D80CA20962AE71E3D6E6A9774E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_11A485033B1E0773431C3D6E6A97F512" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_E0EC8D0BC6FA9354C1063D6E6A973BF4" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_11A485033B1E0773431C3D6E6A97F512" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_E0A555C6A5FB948443883D6E6A972E97" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_E0EC8D0BC6FA9354C1063D6E6A973BF4" xlink:to="loc_us-gaap_InventoryNet_E0A555C6A5FB948443883D6E6A972E97" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_C1A0BFDC6683602E737D3D6E6A974C64" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_E0EC8D0BC6FA9354C1063D6E6A973BF4" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_C1A0BFDC6683602E737D3D6E6A974C64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeAssetsCurrent" xlink:label="loc_us-gaap_DerivativeAssetsCurrent_797DA8FDDB1842FC123A3D6E6A9746E9" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_E0EC8D0BC6FA9354C1063D6E6A973BF4" xlink:to="loc_us-gaap_DerivativeAssetsCurrent_797DA8FDDB1842FC123A3D6E6A9746E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_D1909418D28965A9294D3D6E6A979C80" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_E0EC8D0BC6FA9354C1063D6E6A973BF4" xlink:to="loc_us-gaap_OtherAssetsCurrent_D1909418D28965A9294D3D6E6A979C80" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_B0E90FCDF9B01738B7F53D6E6A976643" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_E0EC8D0BC6FA9354C1063D6E6A973BF4" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_B0E90FCDF9B01738B7F53D6E6A976643" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_04A22C360ADFB1BE151A3D6E6A97D1EF" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_E0EC8D0BC6FA9354C1063D6E6A973BF4" xlink:to="loc_us-gaap_AssetsCurrent_04A22C360ADFB1BE151A3D6E6A97D1EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_794ED7468C046A5339073D6E6A970078" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A322D29C0009B46A3A553D6E6A9702AA" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_794ED7468C046A5339073D6E6A970078" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_ADDCE86BAFDA573E979F3D6E6A97916B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A322D29C0009B46A3A553D6E6A9702AA" xlink:to="loc_us-gaap_Goodwill_ADDCE86BAFDA573E979F3D6E6A97916B" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_IntangibleAssetsNetExcludingGoodwillAndOtherAssetsNoncurrent" xlink:label="loc_int_IntangibleAssetsNetExcludingGoodwillAndOtherAssetsNoncurrent_39D5989548C3E775CD563D6E6A9802EB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A322D29C0009B46A3A553D6E6A9702AA" xlink:to="loc_int_IntangibleAssetsNetExcludingGoodwillAndOtherAssetsNoncurrent_39D5989548C3E775CD563D6E6A9802EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_C3657D021DDC126A4C033D6E6A98A12E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A322D29C0009B46A3A553D6E6A9702AA" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_C3657D021DDC126A4C033D6E6A98A12E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_27C49E6891491EE250773D6E6A98801D" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A322D29C0009B46A3A553D6E6A9702AA" xlink:to="loc_us-gaap_Assets_27C49E6891491EE250773D6E6A98801D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesAbstract" xlink:label="loc_us-gaap_LiabilitiesAbstract_6EAEF3F8B07F6B6925853D6E6A9879DB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4EDD3B667B8103D919163D6E6A97F2B1" xlink:to="loc_us-gaap_LiabilitiesAbstract_6EAEF3F8B07F6B6925853D6E6A9879DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_614B0FF406296140E6793D6E6A98CD70" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_6EAEF3F8B07F6B6925853D6E6A9879DB" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_614B0FF406296140E6793D6E6A98CD70" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtCurrent" xlink:label="loc_us-gaap_DebtCurrent_F1AD6C34EFA488C2AEA53D6E6A98DAE1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_614B0FF406296140E6793D6E6A98CD70" xlink:to="loc_us-gaap_DebtCurrent_F1AD6C34EFA488C2AEA53D6E6A98DAE1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_28EB9530AA10A1E04BDD3D6E6A981607" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_614B0FF406296140E6793D6E6A98CD70" xlink:to="loc_us-gaap_AccountsPayableCurrent_28EB9530AA10A1E04BDD3D6E6A981607" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CustomerDepositsCurrent" xlink:label="loc_us-gaap_CustomerDepositsCurrent_26F91D82EF8339E983373D6E6A98C681" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_614B0FF406296140E6793D6E6A98CD70" xlink:to="loc_us-gaap_CustomerDepositsCurrent_26F91D82EF8339E983373D6E6A98C681" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_1C11813E5524A06372BD3D6E6A9803A1" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_614B0FF406296140E6793D6E6A98CD70" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_1C11813E5524A06372BD3D6E6A9803A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_26B423A6D3C366328C463D6E6A98FD5D" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_614B0FF406296140E6793D6E6A98CD70" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_26B423A6D3C366328C463D6E6A98FD5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_39ED0C03AB719BEEEF363D6E6A984BDE" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_614B0FF406296140E6793D6E6A98CD70" xlink:to="loc_us-gaap_LiabilitiesCurrent_39ED0C03AB719BEEEF363D6E6A984BDE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_4D35407AB1F3EA7559E43D6E6A98D5D2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_6EAEF3F8B07F6B6925853D6E6A9879DB" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_4D35407AB1F3EA7559E43D6E6A98D5D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccruedIncomeTaxesNoncurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesNoncurrent_2ECD52DE2DCB7093A5A83D6E6A98758F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_6EAEF3F8B07F6B6925853D6E6A9879DB" xlink:to="loc_us-gaap_AccruedIncomeTaxesNoncurrent_2ECD52DE2DCB7093A5A83D6E6A98758F" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_DeferredCompensationLiabilityClassifiedAndOtherLiabilitiesNoncurrent" xlink:label="loc_int_DeferredCompensationLiabilityClassifiedAndOtherLiabilitiesNoncurrent_E2E65FD52D8C9A3557BE3D6E6A98B42F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_6EAEF3F8B07F6B6925853D6E6A9879DB" xlink:to="loc_int_DeferredCompensationLiabilityClassifiedAndOtherLiabilitiesNoncurrent_E2E65FD52D8C9A3557BE3D6E6A98B42F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_7E2A562790710ADC83373D6E6A980C0D" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_6EAEF3F8B07F6B6925853D6E6A9879DB" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_7E2A562790710ADC83373D6E6A980C0D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_3C986E3970457B5BFD9B3D6E6A981260" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_6EAEF3F8B07F6B6925853D6E6A9879DB" xlink:to="loc_us-gaap_Liabilities_3C986E3970457B5BFD9B3D6E6A981260" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_F5794EDAA077B7ACDB2D3D6E6A98757C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4EDD3B667B8103D919163D6E6A97F2B1" xlink:to="loc_us-gaap_CommitmentsAndContingencies_F5794EDAA077B7ACDB2D3D6E6A98757C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_A16905942A6EFA2F99A23D6E6A990600" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4EDD3B667B8103D919163D6E6A97F2B1" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_A16905942A6EFA2F99A23D6E6A990600" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_6AE8F8B51D4D319A4EB23D6E6A995E93" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_A16905942A6EFA2F99A23D6E6A990600" xlink:to="loc_us-gaap_StockholdersEquityAbstract_6AE8F8B51D4D319A4EB23D6E6A995E93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_16FC6799E364514E4C333D6E6A9923B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6AE8F8B51D4D319A4EB23D6E6A995E93" xlink:to="loc_us-gaap_PreferredStockValue_16FC6799E364514E4C333D6E6A9923B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_3C9651F9F38DD50F16593D6E6A998B76" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6AE8F8B51D4D319A4EB23D6E6A995E93" xlink:to="loc_us-gaap_CommonStockValue_3C9651F9F38DD50F16593D6E6A998B76" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_C129D280E84C0DCAF0E73D6E6A99013E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6AE8F8B51D4D319A4EB23D6E6A995E93" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_C129D280E84C0DCAF0E73D6E6A99013E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_9C1EE815CC032835F3463D6E6A99EF23" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6AE8F8B51D4D319A4EB23D6E6A995E93" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_9C1EE815CC032835F3463D6E6A99EF23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_005155A91693FE97DE813D6E6A99D89C" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6AE8F8B51D4D319A4EB23D6E6A995E93" xlink:to="loc_us-gaap_StockholdersEquity_005155A91693FE97DE813D6E6A99D89C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_57A1BCC4CD78FF68FC3D3D6E6A996BAF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_A16905942A6EFA2F99A23D6E6A990600" xlink:to="loc_us-gaap_MinorityInterest_57A1BCC4CD78FF68FC3D3D6E6A996BAF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_C1FA776A9E37B64B31353D6E6A998DC4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_A16905942A6EFA2F99A23D6E6A990600" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_C1FA776A9E37B64B31353D6E6A998DC4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_F280E1CCAB9AC4545C453D6E6A99EF9D" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4EDD3B667B8103D919163D6E6A97F2B1" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_F280E1CCAB9AC4545C453D6E6A99EF9D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/CorrectionOfPreviouslyIssuedFinancialInformationConsolidatedBalanceSheetsSharesInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/CorrectionOfPreviouslyIssuedFinancialInformationConsolidatedStatementsOfIncomeAndComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_39D48D9CBBAE330B10EA439944B2373C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_StatementTable_39D48D9CBBAE330B10EA439944B2373C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_180ED0FD9D50760F5F38439944B2649B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_39D48D9CBBAE330B10EA439944B2373C" xlink:to="loc_us-gaap_StatementScenarioAxis_180ED0FD9D50760F5F38439944B2649B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_F5F954BE2568230D024A439944B34A1C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_180ED0FD9D50760F5F38439944B2649B" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_F5F954BE2568230D024A439944B34A1C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_F5F954BE2568230D024A439944B34A1C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_180ED0FD9D50760F5F38439944B2649B" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_F5F954BE2568230D024A439944B34A1C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScenarioPreviouslyReportedMember" xlink:label="loc_us-gaap_ScenarioPreviouslyReportedMember_56B380B98DF8CAB1AFED439944B3C0FB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_F5F954BE2568230D024A439944B34A1C" xlink:to="loc_us-gaap_ScenarioPreviouslyReportedMember_56B380B98DF8CAB1AFED439944B3C0FB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestatementAdjustmentMember" xlink:label="loc_us-gaap_RestatementAdjustmentMember_7BDD39677AC1BFFA0957439944B39C1E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_F5F954BE2568230D024A439944B34A1C" xlink:to="loc_us-gaap_RestatementAdjustmentMember_7BDD39677AC1BFFA0957439944B39C1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_B369DD6D06499394161B439944B34D49" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_Revenues_B369DD6D06499394161B439944B34D49" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_113B89F93B5AD5AC8848439944B31034" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_CostOfRevenue_113B89F93B5AD5AC8848439944B31034" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_D8B9226BA23F4ABE711A439944B38E03" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_GrossProfit_D8B9226BA23F4ABE711A439944B38E03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_2C477A4DAEF7388FD077439944B3DB61" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_OperatingExpensesAbstract_2C477A4DAEF7388FD077439944B3DB61" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaap_LaborAndRelatedExpense_3262CCF3A73696D53391439944B31C93" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_2C477A4DAEF7388FD077439944B3DB61" xlink:to="loc_us-gaap_LaborAndRelatedExpense_3262CCF3A73696D53391439944B31C93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_E76C1CA28D59D4B94B9C439944B487FA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_2C477A4DAEF7388FD077439944B3DB61" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_E76C1CA28D59D4B94B9C439944B487FA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_6566B33910C46F188024439944B4C609" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_2C477A4DAEF7388FD077439944B3DB61" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_6566B33910C46F188024439944B4C609" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_A37BCE98770E64DDCDF0439944B41F37" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_2C477A4DAEF7388FD077439944B3DB61" xlink:to="loc_us-gaap_OperatingExpenses_A37BCE98770E64DDCDF0439944B41F37" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_58BB64EC84ABE09E6617439944B4D525" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_OperatingIncomeLoss_58BB64EC84ABE09E6617439944B4D525" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_12E97BEB70CFE614F3CE439944B9827F" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_12E97BEB70CFE614F3CE439944B9827F" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_InterestIncomeExpenseAndOtherFinancialCostsNet" xlink:label="loc_int_InterestIncomeExpenseAndOtherFinancialCostsNet_8B21DBB0B8FDA6354937439944B90BD7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_12E97BEB70CFE614F3CE439944B9827F" xlink:to="loc_int_InterestIncomeExpenseAndOtherFinancialCostsNet_8B21DBB0B8FDA6354937439944B90BD7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_A4C1127895A6EAAC723D439944B98749" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_12E97BEB70CFE614F3CE439944B9827F" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_A4C1127895A6EAAC723D439944B98749" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_5FC730F04CD750A77E11439944B9BAEB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_12E97BEB70CFE614F3CE439944B9827F" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_5FC730F04CD750A77E11439944B9BAEB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_E404A6AB1DBE46F30D01439944BA0936" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_E404A6AB1DBE46F30D01439944BA0936" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_726B8F0377C570F839AC439944BA3380" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_726B8F0377C570F839AC439944BA3380" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_48CCBF632B6E54E48042439944BAE845" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_ProfitLoss_48CCBF632B6E54E48042439944BAE845" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_F9D41113EBF28BED098B439944BA2FEF" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_F9D41113EBF28BED098B439944BA2FEF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_DA42914FC901A5928EBB439944BAA686" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_DA42914FC901A5928EBB439944BAA686" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_F58755694AACAD306405439944BA47BD" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_EarningsPerShareBasic_F58755694AACAD306405439944BA47BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_91B36A90E9C73566D4AD439944BAF333" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_91B36A90E9C73566D4AD439944BAF333" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_355A360073D963849AC4439944BAA42A" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_EarningsPerShareDiluted_355A360073D963849AC4439944BAA42A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3164C843DEA809109820439944BAEF31" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3164C843DEA809109820439944BAEF31" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAbstract" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_7567FA93706EE35E26A7439944BAD414" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59EF0D3FEDC58ED3D170439944B39B18" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_7567FA93706EE35E26A7439944BAD414" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_75E3DA4A7F577EDE16A1439944BAA8D0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_7567FA93706EE35E26A7439944BAD414" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_75E3DA4A7F577EDE16A1439944BAA8D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_54F98E41CD713016AE21439944BBEC6B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_75E3DA4A7F577EDE16A1439944BAA8D0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_54F98E41CD713016AE21439944BBEC6B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_182441DD97C6D4653DBB439944BBBF35" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_75E3DA4A7F577EDE16A1439944BAA8D0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_182441DD97C6D4653DBB439944BBBF35" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_DC01B2DC432C154B217C439944BB2C46" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_75E3DA4A7F577EDE16A1439944BAA8D0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_DC01B2DC432C154B217C439944BB2C46" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_73AC416BEAD14FCEBE90439944BB74E9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_7567FA93706EE35E26A7439944BAD414" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_73AC416BEAD14FCEBE90439944BB74E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_A0EE9F87DCCDD1C78BE1439944BB9383" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_7567FA93706EE35E26A7439944BAD414" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_A0EE9F87DCCDD1C78BE1439944BB9383" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_A916AB7E10DA0AAE9C06439944BB6F4C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_7567FA93706EE35E26A7439944BAD414" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_A916AB7E10DA0AAE9C06439944BB6F4C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/CorrectionOfPreviouslyIssuedFinancialInformationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/Debt" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/DebtAggregateAnnualMaturitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/DebtInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:type="locator" />
    <link:loc xlink:href="int-20161130.xsd#int_ScheduleOfDebtInstrumentsTable" xlink:label="loc_int_ScheduleOfDebtInstrumentsTable_5E55F2089EFFBA3679374839BD794AAD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:to="loc_int_ScheduleOfDebtInstrumentsTable_5E55F2089EFFBA3679374839BD794AAD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_56AB896503EC8ABFC7764839BD7966BA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_int_ScheduleOfDebtInstrumentsTable_5E55F2089EFFBA3679374839BD794AAD" xlink:to="loc_us-gaap_DebtInstrumentAxis_56AB896503EC8ABFC7764839BD7966BA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_B4D9BA59508C5A433BE34839BD79CB17_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_56AB896503EC8ABFC7764839BD7966BA" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_B4D9BA59508C5A433BE34839BD79CB17_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_B4D9BA59508C5A433BE34839BD79CB17" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_56AB896503EC8ABFC7764839BD7966BA" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_B4D9BA59508C5A433BE34839BD79CB17" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_F7F3EA28EC0E349B14BC4839BD791CBD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B4D9BA59508C5A433BE34839BD79CB17" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_F7F3EA28EC0E349B14BC4839BD791CBD" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LettersOfCreditAndBankersAcceptanceMember" xlink:label="loc_int_LettersOfCreditAndBankersAcceptanceMember_9C02A529877E18BEECFD4839BD791FDA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B4D9BA59508C5A433BE34839BD79CB17" xlink:to="loc_int_LettersOfCreditAndBankersAcceptanceMember_9C02A529877E18BEECFD4839BD791FDA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_3B5C52FFB062AFCFAACB4839BD79CA4D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B4D9BA59508C5A433BE34839BD79CB17" xlink:to="loc_us-gaap_SeniorNotesMember_3B5C52FFB062AFCFAACB4839BD79CA4D" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_OtherUncommittedCreditLinesMember" xlink:label="loc_int_OtherUncommittedCreditLinesMember_9D9D0055747FE50BBF804839BD792C0F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B4D9BA59508C5A433BE34839BD79CB17" xlink:to="loc_int_OtherUncommittedCreditLinesMember_9D9D0055747FE50BBF804839BD792C0F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_2ABD65211EFC9606B8A54839BD795935" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_int_ScheduleOfDebtInstrumentsTable_5E55F2089EFFBA3679374839BD794AAD" xlink:to="loc_us-gaap_VariableRateAxis_2ABD65211EFC9606B8A54839BD795935" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_C74FF15C6B1529FB71464839BD79BEC2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_2ABD65211EFC9606B8A54839BD795935" xlink:to="loc_us-gaap_VariableRateDomain_C74FF15C6B1529FB71464839BD79BEC2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_C74FF15C6B1529FB71464839BD79BEC2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_2ABD65211EFC9606B8A54839BD795935" xlink:to="loc_us-gaap_VariableRateDomain_C74FF15C6B1529FB71464839BD79BEC2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BaseRateMember" xlink:label="loc_us-gaap_BaseRateMember_C33D4735DAF941E7F0854839BD791473" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_C74FF15C6B1529FB71464839BD79BEC2" xlink:to="loc_us-gaap_BaseRateMember_C33D4735DAF941E7F0854839BD791473" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EurodollarMember" xlink:label="loc_us-gaap_EurodollarMember_688FD56DC8AE110F6F834839BD7983F4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_C74FF15C6B1529FB71464839BD79BEC2" xlink:to="loc_us-gaap_EurodollarMember_688FD56DC8AE110F6F834839BD7983F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_3DEAC52669C239FD33574839BD7A6D80" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_3DEAC52669C239FD33574839BD7A6D80" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity" xlink:label="loc_int_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity_FD7C13079EE01FB8886A4839BD7A5CBF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:to="loc_int_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity_FD7C13079EE01FB8886A4839BD7A5CBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_AD5EDF43394B03C10E4C4839BD7A2005" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_AD5EDF43394B03C10E4C4839BD7A2005" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_A4BD5A4C06764211D7EF4839BD7A3CF6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_A4BD5A4C06764211D7EF4839BD7A3CF6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_EC1196AE1FCB3FFDDF224839BD7AC1BD" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_EC1196AE1FCB3FFDDF224839BD7AC1BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_5D81E819C67E3FBDE55E4839BD7AB803" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:to="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_5D81E819C67E3FBDE55E4839BD7AB803" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_CDD35DEF47B7FA12A43C4839BD7A3E61" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_CDD35DEF47B7FA12A43C4839BD7A3E61" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_9222175DDF14A269B2604839BD7AA597" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_9222175DDF14A269B2604839BD7AA597" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_411857FED9702826938A4839BD7AFEC1" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_411857FED9702826938A4839BD7AFEC1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_92FD03BFA7CB48E28E424839BD7A73CB" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2B9C58B9B1CE71CB537A4839BD7A1887" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_92FD03BFA7CB48E28E424839BD7A73CB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/DebtInterestIncomeExpenseAndOtherFinancingCostsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/DebtSummaryAndMaturitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_27DCAE9ABDC77B0E19E20A16805A52A0" xlink:type="locator" />
    <link:loc xlink:href="int-20161130.xsd#int_ScheduleOfDebtInstrumentsTable" xlink:label="loc_int_ScheduleOfDebtInstrumentsTable_27F92047BB0823B919520A16805914E3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_27DCAE9ABDC77B0E19E20A16805A52A0" xlink:to="loc_int_ScheduleOfDebtInstrumentsTable_27F92047BB0823B919520A16805914E3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_D2DCFF043574DC92BD020A168059593C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_int_ScheduleOfDebtInstrumentsTable_27F92047BB0823B919520A16805914E3" xlink:to="loc_us-gaap_DebtInstrumentAxis_D2DCFF043574DC92BD020A168059593C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4C9AF4C5DF3EAF13571F0A168059DD29_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_D2DCFF043574DC92BD020A168059593C" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4C9AF4C5DF3EAF13571F0A168059DD29_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4C9AF4C5DF3EAF13571F0A168059DD29" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_D2DCFF043574DC92BD020A168059593C" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4C9AF4C5DF3EAF13571F0A168059DD29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_AF19160A0A9C2088F6890A168059AB0A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4C9AF4C5DF3EAF13571F0A168059DD29" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_AF19160A0A9C2088F6890A168059AB0A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_825DBD9C4C97D8C13F440A1680594200" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4C9AF4C5DF3EAF13571F0A168059DD29" xlink:to="loc_us-gaap_SeniorNotesMember_825DBD9C4C97D8C13F440A1680594200" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeaseObligationsMember" xlink:label="loc_us-gaap_CapitalLeaseObligationsMember_B5FF73C623FCF7FE28710A168059BA78" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4C9AF4C5DF3EAF13571F0A168059DD29" xlink:to="loc_us-gaap_CapitalLeaseObligationsMember_B5FF73C623FCF7FE28710A168059BA78" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_OtherDebtMember" xlink:label="loc_int_OtherDebtMember_2236D1D50BBD0BE811140A168059EE67" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4C9AF4C5DF3EAF13571F0A168059DD29" xlink:to="loc_int_OtherDebtMember_2236D1D50BBD0BE811140A168059EE67" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_FAAED8C0D4B52D9E89AF0A16805913BF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_int_ScheduleOfDebtInstrumentsTable_27F92047BB0823B919520A16805914E3" xlink:to="loc_us-gaap_RangeAxis_FAAED8C0D4B52D9E89AF0A16805913BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_F39379AADCCC3BFAA9CD0A16805A36B4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_FAAED8C0D4B52D9E89AF0A16805913BF" xlink:to="loc_us-gaap_RangeMember_F39379AADCCC3BFAA9CD0A16805A36B4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_F39379AADCCC3BFAA9CD0A16805A36B4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_FAAED8C0D4B52D9E89AF0A16805913BF" xlink:to="loc_us-gaap_RangeMember_F39379AADCCC3BFAA9CD0A16805A36B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_AFB02F2745FF5734F7D00A16805AFC55" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_F39379AADCCC3BFAA9CD0A16805A36B4" xlink:to="loc_us-gaap_MinimumMember_AFB02F2745FF5734F7D00A16805AFC55" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_BB5503CE698DF6FC77220A16805AB5B1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_F39379AADCCC3BFAA9CD0A16805A36B4" xlink:to="loc_us-gaap_MaximumMember_BB5503CE698DF6FC77220A16805AB5B1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtAndCapitalLeaseObligationsAbstract" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligationsAbstract_DE11A5D0779AFFDC57FD0A16805A1E5B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_27DCAE9ABDC77B0E19E20A16805A52A0" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligationsAbstract_DE11A5D0779AFFDC57FD0A16805A1E5B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_0ACB83B9DC22837394A80A16805AC252" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligationsAbstract_DE11A5D0779AFFDC57FD0A16805A1E5B" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligations_0ACB83B9DC22837394A80A16805AC252" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtCurrent" xlink:label="loc_us-gaap_DebtCurrent_F02124410825B917EBDE0A16805A919C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligationsAbstract_DE11A5D0779AFFDC57FD0A16805A1E5B" xlink:to="loc_us-gaap_DebtCurrent_F02124410825B917EBDE0A16805A919C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_12582C303634F16D0DAC0A16805ADD1C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligationsAbstract_DE11A5D0779AFFDC57FD0A16805A1E5B" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_12582C303634F16D0DAC0A16805ADD1C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_72E98DEF9D1B0574B0D70A16805A1084" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_27DCAE9ABDC77B0E19E20A16805A52A0" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_72E98DEF9D1B0574B0D70A16805A1084" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShortTermDebtWeightedAverageInterestRate" xlink:label="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_FC0AFDE8688EED4DA9640A16805ABF3E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_27DCAE9ABDC77B0E19E20A16805A52A0" xlink:to="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_FC0AFDE8688EED4DA9640A16805ABF3E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/DebtTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/DerivativeInstruments" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/DerivativeInstrumentsBalanceSheetLocationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_7DC1CF543535829345023B1958BB508E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_A4CCC8096E3339BBE21B3B1958B9A1DE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_7DC1CF543535829345023B1958BB508E" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_A4CCC8096E3339BBE21B3B1958B9A1DE" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_781FEB3A2A7654BD81E13B1958BA1933" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_A4CCC8096E3339BBE21B3B1958B9A1DE" xlink:to="loc_us-gaap_HedgingDesignationAxis_781FEB3A2A7654BD81E13B1958BA1933" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_E72F2C22306EA93A0E2C3B1958BAAD0D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_781FEB3A2A7654BD81E13B1958BA1933" xlink:to="loc_us-gaap_HedgingDesignationDomain_E72F2C22306EA93A0E2C3B1958BAAD0D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_E72F2C22306EA93A0E2C3B1958BAAD0D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_781FEB3A2A7654BD81E13B1958BA1933" xlink:to="loc_us-gaap_HedgingDesignationDomain_E72F2C22306EA93A0E2C3B1958BAAD0D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_7EEDE7AB433FF44DDA9E3B1958BA1EC1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_E72F2C22306EA93A0E2C3B1958BAAD0D" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_7EEDE7AB433FF44DDA9E3B1958BA1EC1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_D75C5AAAE10C14D6211A3B1958BAAA9D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_E72F2C22306EA93A0E2C3B1958BAAD0D" xlink:to="loc_us-gaap_NondesignatedMember_D75C5AAAE10C14D6211A3B1958BAAA9D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_7B7E002598053F1DB9783B1958BA0DBF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_A4CCC8096E3339BBE21B3B1958B9A1DE" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_7B7E002598053F1DB9783B1958BA0DBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_A8F200F56A7FE40F15FE3B1958BA5967_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_7B7E002598053F1DB9783B1958BA0DBF" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_A8F200F56A7FE40F15FE3B1958BA5967_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_A8F200F56A7FE40F15FE3B1958BA5967" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_7B7E002598053F1DB9783B1958BA0DBF" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_A8F200F56A7FE40F15FE3B1958BA5967" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="loc_us-gaap_CommodityContractMember_8EBEA5E9055D086F73253B1958BA7013" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_A8F200F56A7FE40F15FE3B1958BA5967" xlink:to="loc_us-gaap_CommodityContractMember_8EBEA5E9055D086F73253B1958BA7013" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_8B55F44263D93B8905D53B1958BAF837" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_A8F200F56A7FE40F15FE3B1958BA5967" xlink:to="loc_us-gaap_ForeignExchangeContractMember_8B55F44263D93B8905D53B1958BAF837" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_A680A0684F72641B5C853B1958BA61F2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_A4CCC8096E3339BBE21B3B1958B9A1DE" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_A680A0684F72641B5C853B1958BA61F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_0A3FEFD0611A7854F5623B1958BA6DCA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_A680A0684F72641B5C853B1958BA61F2" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_0A3FEFD0611A7854F5623B1958BA6DCA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_0A3FEFD0611A7854F5623B1958BA6DCA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_A680A0684F72641B5C853B1958BA61F2" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_0A3FEFD0611A7854F5623B1958BA6DCA" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShortTermDerivativeAssetsNetMember" xlink:label="loc_int_ShortTermDerivativeAssetsNetMember_20A5F5714904BB2D806B3B1958BA769A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_0A3FEFD0611A7854F5623B1958BA6DCA" xlink:to="loc_int_ShortTermDerivativeAssetsNetMember_20A5F5714904BB2D806B3B1958BA769A" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_IdentifiableIntangibleAndOtherNonCurrentAssetsMember" xlink:label="loc_int_IdentifiableIntangibleAndOtherNonCurrentAssetsMember_706544A3575A1DE5B8393B1958BB75D8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_0A3FEFD0611A7854F5623B1958BA6DCA" xlink:to="loc_int_IdentifiableIntangibleAndOtherNonCurrentAssetsMember_706544A3575A1DE5B8393B1958BB75D8" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_AccruedExpensesAndOtherCurrentLiabilitiesMember" xlink:label="loc_int_AccruedExpensesAndOtherCurrentLiabilitiesMember_8453BA6010D60A2B67D23B1958BB33A9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_0A3FEFD0611A7854F5623B1958BA6DCA" xlink:to="loc_int_AccruedExpensesAndOtherCurrentLiabilitiesMember_8453BA6010D60A2B67D23B1958BB33A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_449B927C5C608E323E293B1958BB16F5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_0A3FEFD0611A7854F5623B1958BA6DCA" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_449B927C5C608E323E293B1958BB16F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement_7CB1AAEA36D5258B62FA3B1958BB6223" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_7DC1CF543535829345023B1958BB508E" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement_7CB1AAEA36D5258B62FA3B1958BB6223" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement_2F30E735675F5F39CB843B1958BB2ACA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_7DC1CF543535829345023B1958BB508E" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement_2F30E735675F5F39CB843B1958BB2ACA" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/DerivativeInstrumentsEffectOnIncomeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_9867DE6C9DBEDA617D1638C5503FAA25" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3F255800FC7DB8B7F43138C550382C7F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_9867DE6C9DBEDA617D1638C5503FAA25" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3F255800FC7DB8B7F43138C550382C7F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_760CCFD8F4302FE89D0838C55038C070" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3F255800FC7DB8B7F43138C550382C7F" xlink:to="loc_us-gaap_HedgingDesignationAxis_760CCFD8F4302FE89D0838C55038C070" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_CCFCD4C2E544BAD0CE1738C55038250C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_760CCFD8F4302FE89D0838C55038C070" xlink:to="loc_us-gaap_HedgingDesignationDomain_CCFCD4C2E544BAD0CE1738C55038250C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_CCFCD4C2E544BAD0CE1738C55038250C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_760CCFD8F4302FE89D0838C55038C070" xlink:to="loc_us-gaap_HedgingDesignationDomain_CCFCD4C2E544BAD0CE1738C55038250C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_88FC83CBA4D627D2CD5638C550380327" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_CCFCD4C2E544BAD0CE1738C55038250C" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_88FC83CBA4D627D2CD5638C550380327" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_D7F9E4E93BD78B8D137C38C55038CB0E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_CCFCD4C2E544BAD0CE1738C55038250C" xlink:to="loc_us-gaap_NondesignatedMember_D7F9E4E93BD78B8D137C38C55038CB0E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_F7D24A4C25CFCB2EDA8338C55039284E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3F255800FC7DB8B7F43138C550382C7F" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_F7D24A4C25CFCB2EDA8338C55039284E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_2E12B5816A8AD180AAF438C550393F20_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_F7D24A4C25CFCB2EDA8338C55039284E" xlink:to="loc_us-gaap_HedgingRelationshipDomain_2E12B5816A8AD180AAF438C550393F20_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_2E12B5816A8AD180AAF438C550393F20" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_F7D24A4C25CFCB2EDA8338C55039284E" xlink:to="loc_us-gaap_HedgingRelationshipDomain_2E12B5816A8AD180AAF438C550393F20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueHedgingMember" xlink:label="loc_us-gaap_FairValueHedgingMember_DE4DCC571ED11791AADA38C550398500" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_2E12B5816A8AD180AAF438C550393F20" xlink:to="loc_us-gaap_FairValueHedgingMember_DE4DCC571ED11791AADA38C550398500" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashFlowHedgingMember" xlink:label="loc_us-gaap_CashFlowHedgingMember_FB6598C5BF2AECA022E338C55039088B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_2E12B5816A8AD180AAF438C550393F20" xlink:to="loc_us-gaap_CashFlowHedgingMember_FB6598C5BF2AECA022E338C55039088B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_73B3FDCF7389EAF0209B38C550392DE7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3F255800FC7DB8B7F43138C550382C7F" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_73B3FDCF7389EAF0209B38C550392DE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_86352AA3124AE4F7FA8838C550396F80_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_73B3FDCF7389EAF0209B38C550392DE7" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_86352AA3124AE4F7FA8838C550396F80_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_86352AA3124AE4F7FA8838C550396F80" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_73B3FDCF7389EAF0209B38C550392DE7" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_86352AA3124AE4F7FA8838C550396F80" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="loc_us-gaap_CommodityContractMember_B09ADFBBC317281E25EA38C550396216" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_86352AA3124AE4F7FA8838C550396F80" xlink:to="loc_us-gaap_CommodityContractMember_B09ADFBBC317281E25EA38C550396216" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_CommodityContractInventoryHedgingMember" xlink:label="loc_int_CommodityContractInventoryHedgingMember_AD4BB460A00C227F53DA38C550399616" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_86352AA3124AE4F7FA8838C550396F80" xlink:to="loc_int_CommodityContractInventoryHedgingMember_AD4BB460A00C227F53DA38C550399616" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_E7585056943BBB5DA1E038C5503914DB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_86352AA3124AE4F7FA8838C550396F80" xlink:to="loc_us-gaap_ForeignExchangeContractMember_E7585056943BBB5DA1E038C5503914DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_3A08BA5E1FD0A5FC97DE38C5503962E6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3F255800FC7DB8B7F43138C550382C7F" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_3A08BA5E1FD0A5FC97DE38C5503962E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_C18103C7E442BC9105D338C5503920CC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_3A08BA5E1FD0A5FC97DE38C5503962E6" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_C18103C7E442BC9105D338C5503920CC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_C18103C7E442BC9105D338C5503920CC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_3A08BA5E1FD0A5FC97DE38C5503962E6" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_C18103C7E442BC9105D338C5503920CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SalesMember" xlink:label="loc_us-gaap_SalesMember_2F86718333CD6B3D5AAB38C550396180" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_C18103C7E442BC9105D338C5503920CC" xlink:to="loc_us-gaap_SalesMember_2F86718333CD6B3D5AAB38C550396180" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_26BAC90CADDE56E34A8B38C55039650D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_C18103C7E442BC9105D338C5503920CC" xlink:to="loc_us-gaap_CostOfSalesMember_26BAC90CADDE56E34A8B38C55039650D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherIncomeMember" xlink:label="loc_us-gaap_OtherIncomeMember_6B951F47DCA9888FF45D38C5503E5D9A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_C18103C7E442BC9105D338C5503920CC" xlink:to="loc_us-gaap_OtherIncomeMember_6B951F47DCA9888FF45D38C5503E5D9A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_96F54445BEC015FE200838C5503F8656" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_9867DE6C9DBEDA617D1638C5503FAA25" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_96F54445BEC015FE200838C5503F8656" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_105C1D14DE62A3F7860538C5503F1EB0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_9867DE6C9DBEDA617D1638C5503FAA25" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_105C1D14DE62A3F7860538C5503F1EB0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GainLossOnFairValueHedgeIneffectivenessNet" xlink:label="loc_us-gaap_GainLossOnFairValueHedgeIneffectivenessNet_E58A68F82B00679FBE1038C5503FDD6A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_9867DE6C9DBEDA617D1638C5503FAA25" xlink:to="loc_us-gaap_GainLossOnFairValueHedgeIneffectivenessNet_E58A68F82B00679FBE1038C5503FDD6A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet" xlink:label="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_0515FDB1925C4E580BE538C5503FC326" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_9867DE6C9DBEDA617D1638C5503FAA25" xlink:to="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_0515FDB1925C4E580BE538C5503FC326" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet_D2E8F508AE3B8B3D06C038C5503F10E4" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_9867DE6C9DBEDA617D1638C5503FAA25" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet_D2E8F508AE3B8B3D06C038C5503F10E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_E6D19508801C912468D238C5503F8D62" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_9867DE6C9DBEDA617D1638C5503FAA25" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_E6D19508801C912468D238C5503F8D62" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet_1C5BCEF970B9B42F261A38C5503F8023" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_9867DE6C9DBEDA617D1638C5503FAA25" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet_1C5BCEF970B9B42F261A38C5503F8023" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_6E4D489AFF1CBD0C69E238C5503F4618" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_9867DE6C9DBEDA617D1638C5503FAA25" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_6E4D489AFF1CBD0C69E238C5503F4618" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/DerivativeInstrumentsGrossNotionalValuesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_40D7A84C94FEBDF6D56048AC0AFC79E9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_5ED8C7D313CCD45D0FFD48AC0AFA98FA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_40D7A84C94FEBDF6D56048AC0AFC79E9" xlink:to="loc_us-gaap_DerivativeTable_5ED8C7D313CCD45D0FFD48AC0AFA98FA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PositionAxis" xlink:label="loc_us-gaap_PositionAxis_21EC2BEA9FB9FCBE8B4348AC0AFAE03A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_5ED8C7D313CCD45D0FFD48AC0AFA98FA" xlink:to="loc_us-gaap_PositionAxis_21EC2BEA9FB9FCBE8B4348AC0AFAE03A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PositionDomain" xlink:label="loc_us-gaap_PositionDomain_ABC089964613F21B781F48AC0AFA933E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PositionAxis_21EC2BEA9FB9FCBE8B4348AC0AFAE03A" xlink:to="loc_us-gaap_PositionDomain_ABC089964613F21B781F48AC0AFA933E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PositionDomain" xlink:label="loc_us-gaap_PositionDomain_ABC089964613F21B781F48AC0AFA933E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PositionAxis_21EC2BEA9FB9FCBE8B4348AC0AFAE03A" xlink:to="loc_us-gaap_PositionDomain_ABC089964613F21B781F48AC0AFA933E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongMember" xlink:label="loc_us-gaap_LongMember_14C6F5D308A2ED97BF7C48AC0AFA47EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PositionDomain_ABC089964613F21B781F48AC0AFA933E" xlink:to="loc_us-gaap_LongMember_14C6F5D308A2ED97BF7C48AC0AFA47EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShortMember" xlink:label="loc_us-gaap_ShortMember_21A5419EB7A117F82A3B48AC0AFA4B1D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PositionDomain_ABC089964613F21B781F48AC0AFA933E" xlink:to="loc_us-gaap_ShortMember_21A5419EB7A117F82A3B48AC0AFA4B1D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_D3601E9E73BA745963D548AC0AFAB0EB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_5ED8C7D313CCD45D0FFD48AC0AFA98FA" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_D3601E9E73BA745963D548AC0AFAB0EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_C85A056BEB6DE074A41648AC0AFA77DD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_D3601E9E73BA745963D548AC0AFAB0EB" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_C85A056BEB6DE074A41648AC0AFA77DD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_C85A056BEB6DE074A41648AC0AFA77DD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_D3601E9E73BA745963D548AC0AFAB0EB" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_C85A056BEB6DE074A41648AC0AFA77DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="loc_us-gaap_CommodityContractMember_C7A5DD4AB9188097C7A048AC0AFA3735" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_C85A056BEB6DE074A41648AC0AFA77DD" xlink:to="loc_us-gaap_CommodityContractMember_C7A5DD4AB9188097C7A048AC0AFA3735" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_A1D5F572B9BA94DE96DC48AC0AFAD01A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_C85A056BEB6DE074A41648AC0AFA77DD" xlink:to="loc_us-gaap_ForeignExchangeContractMember_A1D5F572B9BA94DE96DC48AC0AFAD01A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CurrencyAxis" xlink:label="loc_us-gaap_CurrencyAxis_B39396A18C13B90026D948AC0AFAA7A3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_5ED8C7D313CCD45D0FFD48AC0AFA98FA" xlink:to="loc_us-gaap_CurrencyAxis_B39396A18C13B90026D948AC0AFAA7A3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_AllCurrenciesDomain" xlink:label="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CurrencyAxis_B39396A18C13B90026D948AC0AFAA7A3" xlink:to="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_AllCurrenciesDomain" xlink:label="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CurrencyAxis_B39396A18C13B90026D948AC0AFAA7A3" xlink:to="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_AUD" xlink:label="loc_currency_AUD_5E7B4BE7F1E08E82483E48AC0AFAB67A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_AUD_5E7B4BE7F1E08E82483E48AC0AFAB67A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_CAD" xlink:label="loc_currency_CAD_D75AD26EDCED591FF12548AC0AFA98D3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_CAD_D75AD26EDCED591FF12548AC0AFA98D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_CHF" xlink:label="loc_currency_CHF_929D4F7E888CE09C7E9848AC0AFB0CCF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_CHF_929D4F7E888CE09C7E9848AC0AFB0CCF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_CLP" xlink:label="loc_currency_CLP_2593922E05E6A5DCFE9948AC0AFB83BD" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_CLP_2593922E05E6A5DCFE9948AC0AFB83BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_COP" xlink:label="loc_currency_COP_163F48B6DC80719705DF48AC0AFB223E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_COP_163F48B6DC80719705DF48AC0AFB223E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_DKK" xlink:label="loc_currency_DKK_7D5745DE99272B38CE2048AC0AFB2F09" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_DKK_7D5745DE99272B38CE2048AC0AFB2F09" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_EUR" xlink:label="loc_currency_EUR_E4D03EAC4CA33F55F70948AC0AFB1A35" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_EUR_E4D03EAC4CA33F55F70948AC0AFB1A35" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_GBP" xlink:label="loc_currency_GBP_57E2079139BCDF43C4E548AC0AFB1813" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_GBP_57E2079139BCDF43C4E548AC0AFB1813" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_INR" xlink:label="loc_currency_INR_9B988A6DF4EC4D3A920A48AC0AFB2992" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_INR_9B988A6DF4EC4D3A920A48AC0AFB2992" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_JPY" xlink:label="loc_currency_JPY_CB1AF96CE83626D9D5E748AC0AFBB9DD" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_JPY_CB1AF96CE83626D9D5E748AC0AFBB9DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_KRW" xlink:label="loc_currency_KRW_A646D7E055A7BA2EFC3048AC0AFB3311" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_KRW_A646D7E055A7BA2EFC3048AC0AFB3311" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_MXN" xlink:label="loc_currency_MXN_483477E765F6FB6FC19648AC0AFB13E4" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_MXN_483477E765F6FB6FC19648AC0AFB13E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_NOK" xlink:label="loc_currency_NOK_05CB98915727116F6FF048AC0AFBB30A" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_NOK_05CB98915727116F6FF048AC0AFBB30A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_NZD" xlink:label="loc_currency_NZD_FB31BCEF3FDF572E933648AC0AFB20D1" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_NZD_FB31BCEF3FDF572E933648AC0AFB20D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_PHP" xlink:label="loc_currency_PHP_9C50045BABBBFFE93D4248AC0AFBAC47" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_PHP_9C50045BABBBFFE93D4248AC0AFBAC47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_PLN" xlink:label="loc_currency_PLN_6EC1F7B60CB8C590126048AC0AFBB293" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_PLN_6EC1F7B60CB8C590126048AC0AFBB293" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_RON" xlink:label="loc_currency_RON_FD93AA30D3DF43817C5F48AC0AFBDC22" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_RON_FD93AA30D3DF43817C5F48AC0AFBDC22" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_SEK" xlink:label="loc_currency_SEK_CFF4AF5B9070056E920948AC0AFB75F4" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_SEK_CFF4AF5B9070056E920948AC0AFB75F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_SGD" xlink:label="loc_currency_SGD_082853FF4E546F4F9E7748AC0AFB19A1" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_SGD_082853FF4E546F4F9E7748AC0AFB19A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd#currency_ZAR" xlink:label="loc_currency_ZAR_09639B7B56C0EB73971148AC0AFB0BC3" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_919B4C418427BF85CC2C48AC0AFA48BE" xlink:to="loc_currency_ZAR_09639B7B56C0EB73971148AC0AFB0BC3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountVolume" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_A9DF3ECE8B8A634DED1D48AC0AFC8421" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_40D7A84C94FEBDF6D56048AC0AFC79E9" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_A9DF3ECE8B8A634DED1D48AC0AFC8421" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeAssetNotionalAmount" xlink:label="loc_us-gaap_DerivativeAssetNotionalAmount_4A5AE6FA86A45F787DF048AC0AFCFD2D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_40D7A84C94FEBDF6D56048AC0AFC79E9" xlink:to="loc_us-gaap_DerivativeAssetNotionalAmount_4A5AE6FA86A45F787DF048AC0AFCFD2D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/DerivativeInstrumentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/FairValueMeasurements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/FairValueMeasurementsAssetsAndLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C17BF5921952A13695B632C3F787FA9B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_BB156D26C6302474442D32C3F786E74D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C17BF5921952A13695B632C3F787FA9B" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_BB156D26C6302474442D32C3F786E74D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6C5417A762DF3D6ECB9232C3F786B790" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_BB156D26C6302474442D32C3F786E74D" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6C5417A762DF3D6ECB9232C3F786B790" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C9BFCA99351F6590845F32C3F7861948_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6C5417A762DF3D6ECB9232C3F786B790" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C9BFCA99351F6590845F32C3F7861948_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C9BFCA99351F6590845F32C3F7861948" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6C5417A762DF3D6ECB9232C3F786B790" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C9BFCA99351F6590845F32C3F7861948" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_B9552B34D9BD680B8F4F32C3F786BDCC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C9BFCA99351F6590845F32C3F7861948" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_B9552B34D9BD680B8F4F32C3F786BDCC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_F512888567B0DBD5586132C3F7868215" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C9BFCA99351F6590845F32C3F7861948" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_F512888567B0DBD5586132C3F7868215" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_05791732D537BB721B4F32C3F7867330" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C9BFCA99351F6590845F32C3F7861948" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_05791732D537BB721B4F32C3F7867330" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9EBF998E3C7DCBCFCB2132C3F786F4B5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_BB156D26C6302474442D32C3F786E74D" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9EBF998E3C7DCBCFCB2132C3F786F4B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_4ABFA0ED35B9DEBAA78A32C3F786410B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9EBF998E3C7DCBCFCB2132C3F786F4B5" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_4ABFA0ED35B9DEBAA78A32C3F786410B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_4ABFA0ED35B9DEBAA78A32C3F786410B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9EBF998E3C7DCBCFCB2132C3F786F4B5" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_4ABFA0ED35B9DEBAA78A32C3F786410B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_4511166E5920F405FE2A32C3F787D26F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_4ABFA0ED35B9DEBAA78A32C3F786410B" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_4511166E5920F405FE2A32C3F787D26F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_8207B1ABC33102CE108032C3F7879D0F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_BB156D26C6302474442D32C3F786E74D" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_8207B1ABC33102CE108032C3F7879D0F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_9A33C6E414E9302D48AE32C3F7879173_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8207B1ABC33102CE108032C3F7879D0F" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_9A33C6E414E9302D48AE32C3F7879173_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_9A33C6E414E9302D48AE32C3F7879173" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8207B1ABC33102CE108032C3F7879D0F" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_9A33C6E414E9302D48AE32C3F7879173" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="loc_us-gaap_CommodityContractMember_4E9104E54A0C4902A12032C3F7875C50" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_9A33C6E414E9302D48AE32C3F7879173" xlink:to="loc_us-gaap_CommodityContractMember_4E9104E54A0C4902A12032C3F7875C50" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_313C29DCA9FE53B7E15632C3F787BE5D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_9A33C6E414E9302D48AE32C3F7879173" xlink:to="loc_us-gaap_ForeignExchangeContractMember_313C29DCA9FE53B7E15632C3F787BE5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_A095068249031441AAA832C3F787AE0F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_BB156D26C6302474442D32C3F786E74D" xlink:to="loc_us-gaap_InvestmentTypeAxis_A095068249031441AAA832C3F787AE0F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_9FA502EE388FBFA1EC7232C3F7877232_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_A095068249031441AAA832C3F787AE0F" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_9FA502EE388FBFA1EC7232C3F7877232_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_9FA502EE388FBFA1EC7232C3F7877232" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_A095068249031441AAA832C3F787AE0F" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_9FA502EE388FBFA1EC7232C3F7877232" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashSurrenderValueMember" xlink:label="loc_us-gaap_CashSurrenderValueMember_10C9F79BC68EAB75929C32C3F78742B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_9FA502EE388FBFA1EC7232C3F7877232" xlink:to="loc_us-gaap_CashSurrenderValueMember_10C9F79BC68EAB75929C32C3F78742B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_51701365570DF63B92F932C3F7882643" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C17BF5921952A13695B632C3F787FA9B" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligations_51701365570DF63B92F932C3F7882643" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NotesReceivableNet" xlink:label="loc_us-gaap_NotesReceivableNet_50574AD979BA22F64BB132C3F7886574" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C17BF5921952A13695B632C3F787FA9B" xlink:to="loc_us-gaap_NotesReceivableNet_50574AD979BA22F64BB132C3F7886574" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_5E6CE40B525068A3706932C3F7887F84" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C17BF5921952A13695B632C3F787FA9B" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_5E6CE40B525068A3706932C3F7887F84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InvestmentsFairValueDisclosure" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_E6CB8D1A6FC96E625C7532C3F788E77D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C17BF5921952A13695B632C3F787FA9B" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_E6CB8D1A6FC96E625C7532C3F788E77D" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_DerivativeAssetInventoriesAndInvestmentsFairValueNet" xlink:label="loc_int_DerivativeAssetInventoriesAndInvestmentsFairValueNet_0ED701E3CF2503C5008132C3F788F7DC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C17BF5921952A13695B632C3F787FA9B" xlink:to="loc_int_DerivativeAssetInventoriesAndInvestmentsFairValueNet_0ED701E3CF2503C5008132C3F788F7DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_B8DCD36DD2C92578CD5A32C3F788E934" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C17BF5921952A13695B632C3F787FA9B" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_B8DCD36DD2C92578CD5A32C3F788E934" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_DerivativeAndInventoryLiabilityFairValueNet" xlink:label="loc_int_DerivativeAndInventoryLiabilityFairValueNet_4CB5F6B8C79270C44BFA32C3F7884A57" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C17BF5921952A13695B632C3F787FA9B" xlink:to="loc_int_DerivativeAndInventoryLiabilityFairValueNet_4CB5F6B8C79270C44BFA32C3F7884A57" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/FairValueMeasurementsCommodityAndForeignCurrencyContractsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OffsettingAssetsLineItems" xlink:label="loc_us-gaap_OffsettingAssetsLineItems_7E3A49F53935B6CF31C50A167FDB353B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OffsettingAssetsTable" xlink:label="loc_us-gaap_OffsettingAssetsTable_7BFFF35FEA986F8E25E00A167FDB6CE9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OffsettingAssetsLineItems_7E3A49F53935B6CF31C50A167FDB353B" xlink:to="loc_us-gaap_OffsettingAssetsTable_7BFFF35FEA986F8E25E00A167FDB6CE9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_6D3C9D697E549041AF580A167FDBA1E4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OffsettingAssetsTable_7BFFF35FEA986F8E25E00A167FDB6CE9" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_6D3C9D697E549041AF580A167FDBA1E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_86C1B1FAE5BB7F0E3C3D0A167FDB5BA8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_6D3C9D697E549041AF580A167FDBA1E4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_86C1B1FAE5BB7F0E3C3D0A167FDB5BA8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_86C1B1FAE5BB7F0E3C3D0A167FDB5BA8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_6D3C9D697E549041AF580A167FDBA1E4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_86C1B1FAE5BB7F0E3C3D0A167FDB5BA8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="loc_us-gaap_CommodityContractMember_7967FDD682DC29BE4E2E0A167FDBC61F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_86C1B1FAE5BB7F0E3C3D0A167FDB5BA8" xlink:to="loc_us-gaap_CommodityContractMember_7967FDD682DC29BE4E2E0A167FDBC61F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_1EF038D4B4CD2E347BA00A167FDBDE54" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_86C1B1FAE5BB7F0E3C3D0A167FDB5BA8" xlink:to="loc_us-gaap_ForeignExchangeContractMember_1EF038D4B4CD2E347BA00A167FDBDE54" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_8CA2384E665F14A376620A167FDB12B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingAssetsLineItems_7E3A49F53935B6CF31C50A167FDB353B" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_8CA2384E665F14A376620A167FDB12B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeAssetFairValueGrossLiability" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_8E90C3309ECFAF5DC8500A167FDCAE74" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingAssetsLineItems_7E3A49F53935B6CF31C50A167FDB353B" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_8E90C3309ECFAF5DC8500A167FDCAE74" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_ED659C95761D217A4AD60A167FDC7D6E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingAssetsLineItems_7E3A49F53935B6CF31C50A167FDB353B" xlink:to="loc_us-gaap_DerivativeAssets_ED659C95761D217A4AD60A167FDC7D6E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeCollateralObligationToReturnCash" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_8F6D84FD6E3A8DBBA7660A167FDCB5E2" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingAssetsLineItems_7E3A49F53935B6CF31C50A167FDB353B" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_8F6D84FD6E3A8DBBA7660A167FDCB5E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangementDeduction" xlink:label="loc_us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangementDeduction_B595AA3F5687EFD8BD0C0A167FDC84CE" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingAssetsLineItems_7E3A49F53935B6CF31C50A167FDB353B" xlink:to="loc_us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangementDeduction_B595AA3F5687EFD8BD0C0A167FDC84CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_C36693CB4F4E73F9D53B0A167FDCA541" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingAssetsLineItems_7E3A49F53935B6CF31C50A167FDB353B" xlink:to="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_C36693CB4F4E73F9D53B0A167FDCA541" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OffsettingLiabilitiesLineItems" xlink:label="loc_us-gaap_OffsettingLiabilitiesLineItems_B18B236076C87E25C93A0A167FDCCDC3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OffsettingLiabilitiesTable" xlink:label="loc_us-gaap_OffsettingLiabilitiesTable_720F49979E7924F452F90A167FDC511E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OffsettingLiabilitiesLineItems_B18B236076C87E25C93A0A167FDCCDC3" xlink:to="loc_us-gaap_OffsettingLiabilitiesTable_720F49979E7924F452F90A167FDC511E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_D5730ED99E474D046E820A167FDC289D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OffsettingLiabilitiesTable_720F49979E7924F452F90A167FDC511E" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_D5730ED99E474D046E820A167FDC289D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_6F9B84151DC87550F35D0A167FDCCC5C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingLiabilitiesLineItems_B18B236076C87E25C93A0A167FDCCDC3" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_6F9B84151DC87550F35D0A167FDCCC5C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_8DC42DC81A98524949E50A167FDCBCF7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingLiabilitiesLineItems_B18B236076C87E25C93A0A167FDCCDC3" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_8DC42DC81A98524949E50A167FDCBCF7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_720F60839B5661DF802E0A167FDC0502" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingLiabilitiesLineItems_B18B236076C87E25C93A0A167FDCCDC3" xlink:to="loc_us-gaap_DerivativeLiabilities_720F60839B5661DF802E0A167FDC0502" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeCollateralRightToReclaimCash" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimCash_E9197183006C2B10D3160A167FDD9A61" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingLiabilitiesLineItems_B18B236076C87E25C93A0A167FDCCDC3" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_E9197183006C2B10D3160A167FDD9A61" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangementDeduction" xlink:label="loc_us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangementDeduction_566AA96F6B3952FE55E30A167FDD29F0" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingLiabilitiesLineItems_B18B236076C87E25C93A0A167FDCCDC3" xlink:to="loc_us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangementDeduction_566AA96F6B3952FE55E30A167FDD29F0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_6AC893187976FE5A57600A167FDD5972" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingLiabilitiesLineItems_B18B236076C87E25C93A0A167FDCCDC3" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_6AC893187976FE5A57600A167FDD5972" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/FairValueMeasurementsLevel3InputsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/FairValueMeasurementsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/GoodwillAndIdentifiableIntangibleAssets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/GoodwillAndIdentifiableIntangibleAssetsFutureEstimatedAmortizationOfIdentifiableIntangibleAssetsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/GoodwillAndIdentifiableIntangibleAssetsGoodwillDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_80407BC93053BD6F16E10A168072D30E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_C008001DAA33EDA350360A168071A966" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_80407BC93053BD6F16E10A168072D30E" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_C008001DAA33EDA350360A168071A966" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_602ECB52A891D8645BB20A168072E238" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_C008001DAA33EDA350360A168071A966" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_602ECB52A891D8645BB20A168072E238" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_DEA08A965066B8BB52240A1680729683_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_602ECB52A891D8645BB20A168072E238" xlink:to="loc_us-gaap_SegmentDomain_DEA08A965066B8BB52240A1680729683_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_DEA08A965066B8BB52240A1680729683" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_602ECB52A891D8645BB20A168072E238" xlink:to="loc_us-gaap_SegmentDomain_DEA08A965066B8BB52240A1680729683" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_AviationSegmentMember" xlink:label="loc_int_AviationSegmentMember_9848C99DB40BB5AFC65D0A1680728F37" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_DEA08A965066B8BB52240A1680729683" xlink:to="loc_int_AviationSegmentMember_9848C99DB40BB5AFC65D0A1680728F37" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_MarineSegmentMember" xlink:label="loc_int_MarineSegmentMember_8CE9B7A652132C472EF80A1680725181" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_DEA08A965066B8BB52240A1680729683" xlink:to="loc_int_MarineSegmentMember_8CE9B7A652132C472EF80A1680725181" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_LandSegmentMember" xlink:label="loc_int_LandSegmentMember_829E57B1CA6CB40F1DA90A168072B785" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_DEA08A965066B8BB52240A1680729683" xlink:to="loc_int_LandSegmentMember_829E57B1CA6CB40F1DA90A168072B785" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_99365BD7526DF61F12980A1680726644" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_80407BC93053BD6F16E10A168072D30E" xlink:to="loc_us-gaap_GoodwillRollForward_99365BD7526DF61F12980A1680726644" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_3D7DB78BEAA71A9F090C0A16807268AC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_99365BD7526DF61F12980A1680726644" xlink:to="loc_us-gaap_Goodwill_3D7DB78BEAA71A9F090C0A16807268AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_19F1D7529FAB2F4557B50A168072A606" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_99365BD7526DF61F12980A1680726644" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_19F1D7529FAB2F4557B50A168072A606" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_GoodwillHeldForSale" xlink:label="loc_int_GoodwillHeldForSale_901827354F9EC38410F80A168072BF56" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_99365BD7526DF61F12980A1680726644" xlink:to="loc_int_GoodwillHeldForSale_901827354F9EC38410F80A168072BF56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_81B210AF62BA02DE746D0A1FFA24C47B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_99365BD7526DF61F12980A1680726644" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_81B210AF62BA02DE746D0A1FFA24C47B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_3736DCAD0A509EC1E7160A168072719F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_99365BD7526DF61F12980A1680726644" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_3736DCAD0A509EC1E7160A168072719F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/GoodwillAndIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="int-20161130.xsd#int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems" xlink:label="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_47EB6175F22C4BF22ECD25B609ED8A60" xlink:type="locator" />
    <link:loc xlink:href="int-20161130.xsd#int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassTable" xlink:label="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassTable_3ED3631EEDFC17EB7C1025B609ECD5C8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_47EB6175F22C4BF22ECD25B609ED8A60" xlink:to="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassTable_3ED3631EEDFC17EB7C1025B609ECD5C8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2559FE35D36240792B1925B609EC11E2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassTable_3ED3631EEDFC17EB7C1025B609ECD5C8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2559FE35D36240792B1925B609EC11E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_35F2E9F3E90D2F8CE2FA25B609EC1A93_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2559FE35D36240792B1925B609EC11E2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_35F2E9F3E90D2F8CE2FA25B609EC1A93_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_35F2E9F3E90D2F8CE2FA25B609EC1A93" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2559FE35D36240792B1925B609EC11E2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_35F2E9F3E90D2F8CE2FA25B609EC1A93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_AD2324BD731A21C8189925B609ED943E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_35F2E9F3E90D2F8CE2FA25B609EC1A93" xlink:to="loc_us-gaap_CustomerRelationshipsMember_AD2324BD731A21C8189925B609ED943E" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_SupplierAgreementsMember" xlink:label="loc_int_SupplierAgreementsMember_4354BB735222F9DAE9B925B609EDAC59" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_35F2E9F3E90D2F8CE2FA25B609EC1A93" xlink:to="loc_int_SupplierAgreementsMember_4354BB735222F9DAE9B925B609EDAC59" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_700DAA775B89E5ADA54A25B609ED2241" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_35F2E9F3E90D2F8CE2FA25B609EC1A93" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_700DAA775B89E5ADA54A25B609ED2241" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_16E6EAC20112E7550D5225B609ED5DBF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassTable_3ED3631EEDFC17EB7C1025B609ECD5C8" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_16E6EAC20112E7550D5225B609ED5DBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_26FDF2ACB4EF7BF714A925B609ED95AC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_16E6EAC20112E7550D5225B609ED5DBF" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_26FDF2ACB4EF7BF714A925B609ED95AC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_26FDF2ACB4EF7BF714A925B609ED95AC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_16E6EAC20112E7550D5225B609ED5DBF" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_26FDF2ACB4EF7BF714A925B609ED95AC" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_TrademarksAndTradeNamesRightsMember" xlink:label="loc_int_TrademarksAndTradeNamesRightsMember_A0107F84C1BC24F563B925B609ED4954" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_26FDF2ACB4EF7BF714A925B609ED95AC" xlink:to="loc_int_TrademarksAndTradeNamesRightsMember_A0107F84C1BC24F563B925B609ED4954" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_E2C6FE41165B4C11E8AB25B609EDF156" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_47EB6175F22C4BF22ECD25B609ED8A60" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_E2C6FE41165B4C11E8AB25B609EDF156" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_DAE68CB63593FBFAF90B25B609EDC469" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_47EB6175F22C4BF22ECD25B609ED8A60" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_DAE68CB63593FBFAF90B25B609EDC469" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_9B14A90BF87BE9B1163825B609ED7596" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_47EB6175F22C4BF22ECD25B609ED8A60" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_9B14A90BF87BE9B1163825B609ED7596" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_B68C0B0CB11115331C0425B609EDB34D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_47EB6175F22C4BF22ECD25B609ED8A60" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_B68C0B0CB11115331C0425B609EDB34D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_549D8920E96CB432BD9625B609EDFCCB" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_47EB6175F22C4BF22ECD25B609ED8A60" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_549D8920E96CB432BD9625B609EDFCCB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8EE699E49793CACAE60425B609ED641E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_47EB6175F22C4BF22ECD25B609ED8A60" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8EE699E49793CACAE60425B609ED641E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/GoodwillAndIdentifiableIntangibleAssetsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/IncomeTaxes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/IncomeTaxesIncomeTaxContingenciesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxContingencyLineItems" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_851C0A41BFC5066CCEB04D2412728ECD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxContingencyTable" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_340A46D011B79E45AC4D4D24126DE8C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_851C0A41BFC5066CCEB04D2412728ECD" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_340A46D011B79E45AC4D4D24126DE8C1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxAuthorityNameAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameAxis_EE6D98BD9665DC5154354D24126DCB68" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_340A46D011B79E45AC4D4D24126DE8C1" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameAxis_EE6D98BD9665DC5154354D24126DCB68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxAuthorityNameDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_5D65098059CA6F49CA494D24126DA905_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_EE6D98BD9665DC5154354D24126DCB68" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_5D65098059CA6F49CA494D24126DA905_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxAuthorityNameDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_5D65098059CA6F49CA494D24126DA905" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_EE6D98BD9665DC5154354D24126DCB68" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_5D65098059CA6F49CA494D24126DA905" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_TaxAuthoritySouthKoreaSRTOMember" xlink:label="loc_int_TaxAuthoritySouthKoreaSRTOMember_5113D5C1DE9F34F037054D241272BD86" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_5D65098059CA6F49CA494D24126DA905" xlink:to="loc_int_TaxAuthoritySouthKoreaSRTOMember_5113D5C1DE9F34F037054D241272BD86" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_IncomeTaxExaminationPreAssessmentPenaltiesExpense" xlink:label="loc_int_IncomeTaxExaminationPreAssessmentPenaltiesExpense_9AB7FE3FE856E0001C2B4D241273A5B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_851C0A41BFC5066CCEB04D2412728ECD" xlink:to="loc_int_IncomeTaxExaminationPreAssessmentPenaltiesExpense_9AB7FE3FE856E0001C2B4D241273A5B7" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/IncomeTaxesNetOperatingLossesAndIncomeTaxConcessionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLossCarryforwardsLineItems" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_55F25E51D7B73B31713147FB16EF3678" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLossCarryforwardsTable" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_B529C7C6FD326122040C47FB16EEB3D7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_55F25E51D7B73B31713147FB16EF3678" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_B529C7C6FD326122040C47FB16EEB3D7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="int-20161130.xsd#int_DeferredTaxAssetExpirationDateAxis" xlink:label="loc_int_DeferredTaxAssetExpirationDateAxis_24C336AB1D1896265E0747FB16EE1D03" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_B529C7C6FD326122040C47FB16EEB3D7" xlink:to="loc_int_DeferredTaxAssetExpirationDateAxis_24C336AB1D1896265E0747FB16EE1D03" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_DeferredTaxAssetExpirationDateDomain" xlink:label="loc_int_DeferredTaxAssetExpirationDateDomain_4C7F3D045F486341005847FB16EE4B52_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_int_DeferredTaxAssetExpirationDateAxis_24C336AB1D1896265E0747FB16EE1D03" xlink:to="loc_int_DeferredTaxAssetExpirationDateDomain_4C7F3D045F486341005847FB16EE4B52_default" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_DeferredTaxAssetExpirationDateDomain" xlink:label="loc_int_DeferredTaxAssetExpirationDateDomain_4C7F3D045F486341005847FB16EE4B52" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_int_DeferredTaxAssetExpirationDateAxis_24C336AB1D1896265E0747FB16EE1D03" xlink:to="loc_int_DeferredTaxAssetExpirationDateDomain_4C7F3D045F486341005847FB16EE4B52" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ExpirationOn31December2021Member" xlink:label="loc_int_ExpirationOn31December2021Member_BE88985698B89F4BDD2547FB16EECF52" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_DeferredTaxAssetExpirationDateDomain_4C7F3D045F486341005847FB16EE4B52" xlink:to="loc_int_ExpirationOn31December2021Member_BE88985698B89F4BDD2547FB16EECF52" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ExpirationOn31December2022Member" xlink:label="loc_int_ExpirationOn31December2022Member_A98FB9DA9E6DB411993847FB16EF3E72" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_DeferredTaxAssetExpirationDateDomain_4C7F3D045F486341005847FB16EE4B52" xlink:to="loc_int_ExpirationOn31December2022Member_A98FB9DA9E6DB411993847FB16EF3E72" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ExpirationOn31December2023Member" xlink:label="loc_int_ExpirationOn31December2023Member_EC2BCD08D8A72A9CA2A347FB16EF7A3A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_DeferredTaxAssetExpirationDateDomain_4C7F3D045F486341005847FB16EE4B52" xlink:to="loc_int_ExpirationOn31December2023Member_EC2BCD08D8A72A9CA2A347FB16EF7A3A" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ExpirationOn31December2024Member" xlink:label="loc_int_ExpirationOn31December2024Member_3B17C53E54D9C4F208D947FB16EF3D97" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_DeferredTaxAssetExpirationDateDomain_4C7F3D045F486341005847FB16EE4B52" xlink:to="loc_int_ExpirationOn31December2024Member_3B17C53E54D9C4F208D947FB16EF3D97" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ExpirationOn31December2025Member" xlink:label="loc_int_ExpirationOn31December2025Member_DED031AB8EC28C4EF2BD47FB16EFB46E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_DeferredTaxAssetExpirationDateDomain_4C7F3D045F486341005847FB16EE4B52" xlink:to="loc_int_ExpirationOn31December2025Member_DED031AB8EC28C4EF2BD47FB16EFB46E" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ExpirationOn31December2036Member" xlink:label="loc_int_ExpirationOn31December2036Member_8670C4982FD58C69B3E147FB16EF7029" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_DeferredTaxAssetExpirationDateDomain_4C7F3D045F486341005847FB16EE4B52" xlink:to="loc_int_ExpirationOn31December2036Member_8670C4982FD58C69B3E147FB16EF7029" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_IndefiniteMember" xlink:label="loc_int_IndefiniteMember_3162785AD4656BE41E4847FB16EF400B" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_DeferredTaxAssetExpirationDateDomain_4C7F3D045F486341005847FB16EE4B52" xlink:to="loc_int_IndefiniteMember_3162785AD4656BE41E4847FB16EF400B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="loc_us-gaap_OperatingLossCarryforwards_9D45535B57199E4B9DF347FB16EF0610" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_55F25E51D7B73B31713147FB16EF3678" xlink:to="loc_us-gaap_OperatingLossCarryforwards_9D45535B57199E4B9DF347FB16EF0610" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_38B71FCBB55FF2C2808647FB16F07872" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_55F25E51D7B73B31713147FB16EF3678" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_38B71FCBB55FF2C2808647FB16F07872" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_349D9436B6E68FCC4B0347FB16F03190" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_55F25E51D7B73B31713147FB16EF3678" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_349D9436B6E68FCC4B0347FB16F03190" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_PeriodApplicableIncomeTaxConcession" xlink:label="loc_int_PeriodApplicableIncomeTaxConcession_8DFCBFDE5E13711B810947FB16F0CFA0" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_55F25E51D7B73B31713147FB16EF3678" xlink:to="loc_int_PeriodApplicableIncomeTaxConcession_8DFCBFDE5E13711B810947FB16F0CFA0" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_IncomeTaxConcessionImpactOnForeignTaxes" xlink:label="loc_int_IncomeTaxConcessionImpactOnForeignTaxes_C7C95229C7F1FF0BA30447FB16F017B2" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_55F25E51D7B73B31713147FB16EF3678" xlink:to="loc_int_IncomeTaxConcessionImpactOnForeignTaxes_C7C95229C7F1FF0BA30447FB16F017B2" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_IncomeTaxConcessionImpactonBasicEarningsperShare" xlink:label="loc_int_IncomeTaxConcessionImpactonBasicEarningsperShare_C8D077AAEBD4CEE3342547FB16F016AA" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_55F25E51D7B73B31713147FB16EF3678" xlink:to="loc_int_IncomeTaxConcessionImpactonBasicEarningsperShare_C8D077AAEBD4CEE3342547FB16F016AA" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_IncomeTaxConcessionImpactOnDilutedEarningsPerShare" xlink:label="loc_int_IncomeTaxConcessionImpactOnDilutedEarningsPerShare_5C95BFF26438FB9EDC1347FB16F0AF99" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_55F25E51D7B73B31713147FB16EF3678" xlink:to="loc_int_IncomeTaxConcessionImpactOnDilutedEarningsPerShare_5C95BFF26438FB9EDC1347FB16F0AF99" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/IncomeTaxesTaxProvisionBenefitReconciliationAndTaxRatesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/IncomeTaxesTemporaryDifferencesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/PropertyAndEquipment" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/PropertyAndEquipmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_F964E216FC5BACC8A70EA4048B63D4FB" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1E00D011B7C00172DBE8A4048B5C85F0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_F964E216FC5BACC8A70EA4048B63D4FB" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1E00D011B7C00172DBE8A4048B5C85F0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5991DF1D879178E074C8A4048B5D7B3B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1E00D011B7C00172DBE8A4048B5C85F0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5991DF1D879178E074C8A4048B5D7B3B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5991DF1D879178E074C8A4048B5D7B3B" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5991DF1D879178E074C8A4048B5D7B3B" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LandMember" xlink:label="loc_us-gaap_LandMember_3569428CCFEF0DD12B5DA4048B5D889B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6" xlink:to="loc_us-gaap_LandMember_3569428CCFEF0DD12B5DA4048B5D889B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_4F3E7E4D8B3EAF92203AA4048B5D058C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_4F3E7E4D8B3EAF92203AA4048B5D058C" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_OfficeEquipmentFurnitureAndFixturesMember" xlink:label="loc_int_OfficeEquipmentFurnitureAndFixturesMember_87F3422D916BFED45C55A4048B5D8C8D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6" xlink:to="loc_int_OfficeEquipmentFurnitureAndFixturesMember_87F3422D916BFED45C55A4048B5D8C8D" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ComputerEquipmentAndSoftwareCostsMember" xlink:label="loc_int_ComputerEquipmentAndSoftwareCostsMember_18460C3D054C1AA83B19A4048B5D6727" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6" xlink:to="loc_int_ComputerEquipmentAndSoftwareCostsMember_18460C3D054C1AA83B19A4048B5D6727" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MachineryAndEquipmentMember" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_1E7C645AB0B45CC792D0A4048B625EF6" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_1E7C645AB0B45CC792D0A4048B625EF6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_9DB01F21677CBCE7366BA4048B6243D7" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_9DB01F21677CBCE7366BA4048B6243D7" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_SoftwareDevelopmentInProgressMember" xlink:label="loc_int_SoftwareDevelopmentInProgressMember_39B6932DB03D8510F88AA4048B6277DB" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6" xlink:to="loc_int_SoftwareDevelopmentInProgressMember_39B6932DB03D8510F88AA4048B6277DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsHeldUnderCapitalLeasesMember" xlink:label="loc_us-gaap_AssetsHeldUnderCapitalLeasesMember_F882F27F69501132ECE9A4048B620D43" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E8613AD0E7B4833F0654A4048B5DACF6" xlink:to="loc_us-gaap_AssetsHeldUnderCapitalLeasesMember_F882F27F69501132ECE9A4048B620D43" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_E7662B86CF49B98854E1A4048B62F7BF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1E00D011B7C00172DBE8A4048B5C85F0" xlink:to="loc_us-gaap_RangeAxis_E7662B86CF49B98854E1A4048B62F7BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_50D7E2997D6D7C40FFD7A4048B631C2C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_E7662B86CF49B98854E1A4048B62F7BF" xlink:to="loc_us-gaap_RangeMember_50D7E2997D6D7C40FFD7A4048B631C2C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_50D7E2997D6D7C40FFD7A4048B631C2C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_E7662B86CF49B98854E1A4048B62F7BF" xlink:to="loc_us-gaap_RangeMember_50D7E2997D6D7C40FFD7A4048B631C2C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_19C5918015DB3B730B3FA4048B638735" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_50D7E2997D6D7C40FFD7A4048B631C2C" xlink:to="loc_us-gaap_MinimumMember_19C5918015DB3B730B3FA4048B638735" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_E4A9E3D8799024D41723A4048B63DE2D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_50D7E2997D6D7C40FFD7A4048B631C2C" xlink:to="loc_us-gaap_MaximumMember_E4A9E3D8799024D41723A4048B63DE2D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNetAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_364666C57B55C946E6E6A4048B63DF4F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_F964E216FC5BACC8A70EA4048B63D4FB" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_364666C57B55C946E6E6A4048B63DF4F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_D23DD9267D57BA73F58EA4048B6372E0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_364666C57B55C946E6E6A4048B63DF4F" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_D23DD9267D57BA73F58EA4048B6372E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_6A82C13A5578F7C740CEA4048B63BBE4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_364666C57B55C946E6E6A4048B63DF4F" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_6A82C13A5578F7C740CEA4048B63BBE4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_94CB6C4614E3904A6E7CA40B1F40AF63" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_364666C57B55C946E6E6A4048B63DF4F" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_94CB6C4614E3904A6E7CA40B1F40AF63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_49F9FFA3A0841E527D60A4048B63E986" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_364666C57B55C946E6E6A4048B63DF4F" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_49F9FFA3A0841E527D60A4048B63E986" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_54EDB43BD47000AAEF6AA4048B635151" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_F964E216FC5BACC8A70EA4048B63D4FB" xlink:to="loc_us-gaap_Depreciation_54EDB43BD47000AAEF6AA4048B635151" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalizedComputerSoftwareNetAbstract" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareNetAbstract_EE0FDE77FDE12D479500A4048B63070E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_F964E216FC5BACC8A70EA4048B63D4FB" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareNetAbstract_EE0FDE77FDE12D479500A4048B63070E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalizedComputerSoftwareGross" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareGross_A999EA9D7D8D46BD3B11A4048B635DB9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedComputerSoftwareNetAbstract_EE0FDE77FDE12D479500A4048B63070E" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareGross_A999EA9D7D8D46BD3B11A4048B635DB9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization_5CAC92BDA1AA275D03B9A4048B63F88A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedComputerSoftwareNetAbstract_EE0FDE77FDE12D479500A4048B63070E" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization_5CAC92BDA1AA275D03B9A4048B63F88A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalizedComputerSoftwareNet" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareNet_E35922E6E27C938A847EA4048B637E60" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedComputerSoftwareNetAbstract_EE0FDE77FDE12D479500A4048B63070E" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareNet_E35922E6E27C938A847EA4048B637E60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalizedComputerSoftwareAmortization1" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_604FE52B36294DA16A4EA4048B63889C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_F964E216FC5BACC8A70EA4048B63D4FB" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_604FE52B36294DA16A4EA4048B63889C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/PropertyAndEquipmentTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquity" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityDividendsAndStockRepurchaseProgramsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityOtherComprehensiveLossAndAccumulatedOtherComprehensiveLossDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B2DD4E7FEEC5E57304410AB29AF5AE43" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_45FE72417114F6A0648F0AB29AF54ADB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B2DD4E7FEEC5E57304410AB29AF5AE43" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_45FE72417114F6A0648F0AB29AF54ADB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_B918AE3C0E12D385FA950AB29AF58AA7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_45FE72417114F6A0648F0AB29AF54ADB" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_B918AE3C0E12D385FA950AB29AF58AA7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_34AA0F6CEE2D024424DE0AB29AF592EB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_B918AE3C0E12D385FA950AB29AF58AA7" xlink:to="loc_us-gaap_EquityComponentDomain_34AA0F6CEE2D024424DE0AB29AF592EB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_34AA0F6CEE2D024424DE0AB29AF592EB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_B918AE3C0E12D385FA950AB29AF58AA7" xlink:to="loc_us-gaap_EquityComponentDomain_34AA0F6CEE2D024424DE0AB29AF592EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_80AB129AB74C4EF87E810AB29AF56AB0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_34AA0F6CEE2D024424DE0AB29AF592EB" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_80AB129AB74C4EF87E810AB29AF56AB0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember" xlink:label="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_6944B6D5610E7C0C12D70AB29AF524FE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_34AA0F6CEE2D024424DE0AB29AF592EB" xlink:to="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_6944B6D5610E7C0C12D70AB29AF524FE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember" xlink:label="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_D1E3AA785895980848F20AB29AF5FBE9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_34AA0F6CEE2D024424DE0AB29AF592EB" xlink:to="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_D1E3AA785895980848F20AB29AF5FBE9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_D3BC00D8A019968376570AB29AF5D531" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B2DD4E7FEEC5E57304410AB29AF5AE43" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_D3BC00D8A019968376570AB29AF5D531" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_42B8DA0ED73161122E860AB29AF576A2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_D3BC00D8A019968376570AB29AF5D531" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_42B8DA0ED73161122E860AB29AF576A2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_B17A5EAB9710F88A232C0AB29AF5DB1E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_D3BC00D8A019968376570AB29AF5D531" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_B17A5EAB9710F88A232C0AB29AF5DB1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_47674D1FC47D409B96910AB29AF54214" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_D3BC00D8A019968376570AB29AF5D531" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_47674D1FC47D409B96910AB29AF54214" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityPlanSummaryAndDescriptionDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4BF36160C54F12E5A296337996BAA744" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_54AED582CC6EA2AB5570337996B81492" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4BF36160C54F12E5A296337996BAA744" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_54AED582CC6EA2AB5570337996B81492" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_F36386CE369139599E5A337996B92C8D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_54AED582CC6EA2AB5570337996B81492" xlink:to="loc_us-gaap_PlanNameAxis_F36386CE369139599E5A337996B92C8D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_E78A2E1C9D74E8E89E83337996B94E09_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_F36386CE369139599E5A337996B92C8D" xlink:to="loc_us-gaap_PlanNameDomain_E78A2E1C9D74E8E89E83337996B94E09_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_E78A2E1C9D74E8E89E83337996B94E09" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_F36386CE369139599E5A337996B92C8D" xlink:to="loc_us-gaap_PlanNameDomain_E78A2E1C9D74E8E89E83337996B94E09" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_A2016OmnibusPlanMember" xlink:label="loc_int_A2016OmnibusPlanMember_18C20A59FE1A17A12F8C337996B96FC4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_E78A2E1C9D74E8E89E83337996B94E09" xlink:to="loc_int_A2016OmnibusPlanMember_18C20A59FE1A17A12F8C337996B96FC4" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_Omnibus2006PlanMember" xlink:label="loc_int_Omnibus2006PlanMember_BB70080812A2C79165D9337996B9EA1E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_E78A2E1C9D74E8E89E83337996B94E09" xlink:to="loc_int_Omnibus2006PlanMember_BB70080812A2C79165D9337996B9EA1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_6C4552F62C9B531A9314337996B9CD47" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_54AED582CC6EA2AB5570337996B81492" xlink:to="loc_us-gaap_AwardTypeAxis_6C4552F62C9B531A9314337996B9CD47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56146B21CDB7B6C65614337996B930A9_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_6C4552F62C9B531A9314337996B9CD47" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56146B21CDB7B6C65614337996B930A9_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56146B21CDB7B6C65614337996B930A9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_6C4552F62C9B531A9314337996B9CD47" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56146B21CDB7B6C65614337996B930A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_082A84353F4AC4169A73337996B99F8C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56146B21CDB7B6C65614337996B930A9" xlink:to="loc_us-gaap_RestrictedStockMember_082A84353F4AC4169A73337996B99F8C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_F7D0D3F43A3135F2BCED337996B9B840" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56146B21CDB7B6C65614337996B930A9" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_F7D0D3F43A3135F2BCED337996B9B840" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockAppreciationRightsSARSMember" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_75576484284A52E1D344337996BAFB6A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56146B21CDB7B6C65614337996B930A9" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_75576484284A52E1D344337996BAFB6A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_E98E35FEACBDE371CC2E337996BA74C6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4BF36160C54F12E5A296337996BAA744" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_E98E35FEACBDE371CC2E337996BA74C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_3978F8E639146ECA260D337996BAB59E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4BF36160C54F12E5A296337996BAA744" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_3978F8E639146ECA260D337996BAB59E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2F743076ADCD38A99C42337996BAF1D7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4BF36160C54F12E5A296337996BAA744" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2F743076ADCD38A99C42337996BAF1D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_1E8DC70F93634529EE3E337996BA1C4E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4BF36160C54F12E5A296337996BAA744" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_1E8DC70F93634529EE3E337996BA1C4E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_C57C87A068786717EB71337996BA040E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4BF36160C54F12E5A296337996BAA744" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_C57C87A068786717EB71337996BA040E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityRestrictedStockAwardsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6058FEFADF4DAFD31AD90A168027AE23" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AE18379AC4CD1058ABA10A16802731E1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6058FEFADF4DAFD31AD90A168027AE23" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AE18379AC4CD1058ABA10A16802731E1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_26DD75115859920BB3B30A168027E5CA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AE18379AC4CD1058ABA10A16802731E1" xlink:to="loc_us-gaap_AwardTypeAxis_26DD75115859920BB3B30A168027E5CA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_083F7EC73CD02423B2CE0A168027C3ED_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_26DD75115859920BB3B30A168027E5CA" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_083F7EC73CD02423B2CE0A168027C3ED_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_083F7EC73CD02423B2CE0A168027C3ED" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_26DD75115859920BB3B30A168027E5CA" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_083F7EC73CD02423B2CE0A168027C3ED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_3DC59D930C7427069F510A168027FA9D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_083F7EC73CD02423B2CE0A168027C3ED" xlink:to="loc_us-gaap_RestrictedStockMember_3DC59D930C7427069F510A168027FA9D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_23FCB9834663E62E663A0A168027DDB0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6058FEFADF4DAFD31AD90A168027AE23" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_23FCB9834663E62E663A0A168027DDB0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_D29D07387990A31F6BB70A1680272BF5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_23FCB9834663E62E663A0A168027DDB0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_D29D07387990A31F6BB70A1680272BF5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2165232CAB0587844CA10A168028D399" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_23FCB9834663E62E663A0A168027DDB0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2165232CAB0587844CA10A168028D399" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_D9674C177DCEF37819B50A168028CB57" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_23FCB9834663E62E663A0A168027DDB0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_D9674C177DCEF37819B50A168028CB57" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_E499B06BA8EBA934D3D00A1680288917" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_23FCB9834663E62E663A0A168027DDB0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_E499B06BA8EBA934D3D00A1680288917" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_EF3E10DABD92AD3ED1C70A1680282C60" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6058FEFADF4DAFD31AD90A168027AE23" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_EF3E10DABD92AD3ED1C70A1680282C60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_3B9879F7BE0D01FC3A870A1680282FA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_EF3E10DABD92AD3ED1C70A1680282C60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_3B9879F7BE0D01FC3A870A1680282FA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_C3FA23D8DE881E2809850A168028BD73" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_EF3E10DABD92AD3ED1C70A1680282C60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_C3FA23D8DE881E2809850A168028BD73" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_51B6B001176780AF5D100A1680286704" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_EF3E10DABD92AD3ED1C70A1680282C60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_51B6B001176780AF5D100A1680286704" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_B4B8B889F7206509A2C00A168028C22F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_EF3E10DABD92AD3ED1C70A1680282C60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_B4B8B889F7206509A2C00A168028C22F" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValue" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValue_4B6A6EE4296AB891ECF80A168028E0EF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6058FEFADF4DAFD31AD90A168027AE23" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValue_4B6A6EE4296AB891ECF80A168028E0EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_386F99E6DAC8A6BE00D10A168028FEC4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6058FEFADF4DAFD31AD90A168027AE23" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_386F99E6DAC8A6BE00D10A168028FEC4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_3D1977BFC6D3D3A8E9A40A1680289B75" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6058FEFADF4DAFD31AD90A168027AE23" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_3D1977BFC6D3D3A8E9A40A1680289B75" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityRsuAwardsAndSsarAwardsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B8DF1C4FD6605152F27349EF2A0C86B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_133C023E488A996F282E349EF29F1CA5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B8DF1C4FD6605152F27349EF2A0C86B" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_133C023E488A996F282E349EF29F1CA5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_690A12A982292E819935349EF2A09747" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_133C023E488A996F282E349EF29F1CA5" xlink:to="loc_us-gaap_AwardTypeAxis_690A12A982292E819935349EF2A09747" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3D42F97B42595AE0D310349EF2A0CD87_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_690A12A982292E819935349EF2A09747" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3D42F97B42595AE0D310349EF2A0CD87_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3D42F97B42595AE0D310349EF2A0CD87" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_690A12A982292E819935349EF2A09747" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3D42F97B42595AE0D310349EF2A0CD87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_8026C879FA58725004CA349EF2A0FC58" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3D42F97B42595AE0D310349EF2A0CD87" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_8026C879FA58725004CA349EF2A0FC58" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockAppreciationRightsSARSMember" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_3993B017E7350AAD377E349EF2A0EFCF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3D42F97B42595AE0D310349EF2A0CD87" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_3993B017E7350AAD377E349EF2A0EFCF" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingRollForward" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingRollForward_212C15448DA1F53168E6349EF2A03222" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B8DF1C4FD6605152F27349EF2A0C86B" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingRollForward_212C15448DA1F53168E6349EF2A03222" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_5849DAF70C4F06C8967C349EF2A0193C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingRollForward_212C15448DA1F53168E6349EF2A03222" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_5849DAF70C4F06C8967C349EF2A0193C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_0617661DA4C09176D3C4349EF2A04F1D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingRollForward_212C15448DA1F53168E6349EF2A03222" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_0617661DA4C09176D3C4349EF2A04F1D" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriod" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriod_398724E2D63CB055AFD2349EF2A0D7B1" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingRollForward_212C15448DA1F53168E6349EF2A03222" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriod_398724E2D63CB055AFD2349EF2A0D7B1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_7AF5978733141FB11504349EF2A00A9A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingRollForward_212C15448DA1F53168E6349EF2A03222" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_7AF5978733141FB11504349EF2A00A9A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_5C77D11779B99E54F1D4349EF2A029D2" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingRollForward_212C15448DA1F53168E6349EF2A03222" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_5C77D11779B99E54F1D4349EF2A029D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_059F077AC27C9C3851DE349EF2A10536" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingRollForward_212C15448DA1F53168E6349EF2A03222" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_059F077AC27C9C3851DE349EF2A10536" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_10849EE462E68A02298A349EF2A12709" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B8DF1C4FD6605152F27349EF2A0C86B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_10849EE462E68A02298A349EF2A12709" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_74D3A775B662AD981858349EF2A1D8D9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_10849EE462E68A02298A349EF2A12709" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_74D3A775B662AD981858349EF2A1D8D9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_0F17604B654E590AC159349EF2A12272" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_10849EE462E68A02298A349EF2A12709" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_0F17604B654E590AC159349EF2A12272" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriodWeightedAverageGrantDateFairValue_F73DBA0C26EA99BD6C0A349EF2A12A06" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_10849EE462E68A02298A349EF2A12709" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriodWeightedAverageGrantDateFairValue_F73DBA0C26EA99BD6C0A349EF2A12A06" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_442720080F08B3D6B408349EF2A18AD9" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_10849EE462E68A02298A349EF2A12709" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_442720080F08B3D6B408349EF2A18AD9" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice_DB4EE7CB553EF6FA0A4D349EF2A13FEB" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_10849EE462E68A02298A349EF2A12709" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice_DB4EE7CB553EF6FA0A4D349EF2A13FEB" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice_CB54270BAE795CE2D713349EF2A247B5" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_10849EE462E68A02298A349EF2A12709" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice_CB54270BAE795CE2D713349EF2A247B5" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValue" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValue_4884F9350D8BB00BBD7A349EF2A2F879" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B8DF1C4FD6605152F27349EF2A0C86B" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValue_4884F9350D8BB00BBD7A349EF2A2F879" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_805BF234B3641E2B80E6349EF2A2A276" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B8DF1C4FD6605152F27349EF2A0C86B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_805BF234B3641E2B80E6349EF2A2A276" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriodAggregateIntrinsicValue" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriodAggregateIntrinsicValue_28725DCB8820954FC5AC349EF2A23316" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B8DF1C4FD6605152F27349EF2A0C86B" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriodAggregateIntrinsicValue_28725DCB8820954FC5AC349EF2A23316" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableAbstract" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableAbstract_4E17C7BE609AE564F9E6349EF2A2D5A2" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B8DF1C4FD6605152F27349EF2A0C86B" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableAbstract_4E17C7BE609AE564F9E6349EF2A2D5A2" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber_C0AD3A9453FD04D2C7CB349EF2A2CC6A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableAbstract_4E17C7BE609AE564F9E6349EF2A2D5A2" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber_C0AD3A9453FD04D2C7CB349EF2A2CC6A" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice_207C21F77860F8E8A477349EF2A26FC2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableAbstract_4E17C7BE609AE564F9E6349EF2A2D5A2" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice_207C21F77860F8E8A477349EF2A26FC2" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableIntrinsicValue" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableIntrinsicValue_AFBD861B55F1D98D440D349EF2A25EF9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableAbstract_4E17C7BE609AE564F9E6349EF2A2D5A2" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableIntrinsicValue_AFBD861B55F1D98D440D349EF2A25EF9" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageRemainingContractualTerm" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageRemainingContractualTerm_B06E374DC6493ED136B5349EF2A230F2" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableAbstract_4E17C7BE609AE564F9E6349EF2A2D5A2" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageRemainingContractualTerm_B06E374DC6493ED136B5349EF2A230F2" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodAggregateIntrinsicValue" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodAggregateIntrinsicValue_70389EFC5CF21FA34BE6349EF2A2C274" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B8DF1C4FD6605152F27349EF2A0C86B" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodAggregateIntrinsicValue_70389EFC5CF21FA34BE6349EF2A2C274" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_36537313B8487C4795BC349EF2A28319" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B8DF1C4FD6605152F27349EF2A0C86B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_36537313B8487C4795BC349EF2A28319" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice_C1D1975295FEB573DFB9349EF2A21229" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_36537313B8487C4795BC349EF2A28319" xlink:to="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice_C1D1975295FEB573DFB9349EF2A21229" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_DC2F59EBB2E36DFA5109349EF2A3F7BF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_36537313B8487C4795BC349EF2A28319" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_DC2F59EBB2E36DFA5109349EF2A3F7BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_606F7B73B146838CFC1F349EF2A3D806" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_36537313B8487C4795BC349EF2A28319" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_606F7B73B146838CFC1F349EF2A3D806" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_E47B894D6FDE647AD4A6349EF2A37820" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_36537313B8487C4795BC349EF2A28319" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_E47B894D6FDE647AD4A6349EF2A37820" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_F84794FA205A18D44AE3349EF2A3CD94" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_36537313B8487C4795BC349EF2A28319" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_F84794FA205A18D44AE3349EF2A3CD94" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_36538980885A2E8CE1F0349EF2A38F66" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B8DF1C4FD6605152F27349EF2A0C86B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_36538980885A2E8CE1F0349EF2A38F66" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityUnrecognizedCompensationCostDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnauditedDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_B3BAFD51231BE9E1392D0A167FB3CC72" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_5BD7D7BE379FC32E4DE50A167FB2B5BA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_B3BAFD51231BE9E1392D0A167FB3CC72" xlink:to="loc_us-gaap_StatementTable_5BD7D7BE379FC32E4DE50A167FB2B5BA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_98FCDC4EABF21DE7CA1B0A167FB24D8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_5BD7D7BE379FC32E4DE50A167FB2B5BA" xlink:to="loc_us-gaap_PlanNameAxis_98FCDC4EABF21DE7CA1B0A167FB24D8B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_423A9A1B435F2EA8229D0A167FB2D484_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_98FCDC4EABF21DE7CA1B0A167FB24D8B" xlink:to="loc_us-gaap_PlanNameDomain_423A9A1B435F2EA8229D0A167FB2D484_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_423A9A1B435F2EA8229D0A167FB2D484" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_98FCDC4EABF21DE7CA1B0A167FB24D8B" xlink:to="loc_us-gaap_PlanNameDomain_423A9A1B435F2EA8229D0A167FB2D484" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_EmploymentAgreementMember" xlink:label="loc_int_EmploymentAgreementMember_49476BF669C5E1AB6CE00A167FB290B6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_423A9A1B435F2EA8229D0A167FB2D484" xlink:to="loc_int_EmploymentAgreementMember_49476BF669C5E1AB6CE00A167FB290B6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SelectedQuarterlyFinancialInformationAbstract" xlink:label="loc_us-gaap_SelectedQuarterlyFinancialInformationAbstract_9C6E4F35862990DBE28D0A167FB3713D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_B3BAFD51231BE9E1392D0A167FB3CC72" xlink:to="loc_us-gaap_SelectedQuarterlyFinancialInformationAbstract_9C6E4F35862990DBE28D0A167FB3713D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_31CF37E38EF32DA38D8E0A167FB36D25" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SelectedQuarterlyFinancialInformationAbstract_9C6E4F35862990DBE28D0A167FB3713D" xlink:to="loc_us-gaap_Revenues_31CF37E38EF32DA38D8E0A167FB36D25" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_1F401A686B8F3D5D6E450A167FB30EE7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SelectedQuarterlyFinancialInformationAbstract_9C6E4F35862990DBE28D0A167FB3713D" xlink:to="loc_us-gaap_GrossProfit_1F401A686B8F3D5D6E450A167FB30EE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_AECD97B0CB5B5C6E57940A167FB31465" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SelectedQuarterlyFinancialInformationAbstract_9C6E4F35862990DBE28D0A167FB3713D" xlink:to="loc_us-gaap_ProfitLoss_AECD97B0CB5B5C6E57940A167FB31465" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_8380BB0E9DB1ADF7ABCB0A167FB3D34B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SelectedQuarterlyFinancialInformationAbstract_9C6E4F35862990DBE28D0A167FB3713D" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_8380BB0E9DB1ADF7ABCB0A167FB3D34B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_3760260C8E8A2A5BE9B40A167FB35812" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SelectedQuarterlyFinancialInformationAbstract_9C6E4F35862990DBE28D0A167FB3713D" xlink:to="loc_us-gaap_EarningsPerShareBasic_3760260C8E8A2A5BE9B40A167FB35812" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_0C0ED40729A971EC60660A167FB37973" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SelectedQuarterlyFinancialInformationAbstract_9C6E4F35862990DBE28D0A167FB3713D" xlink:to="loc_us-gaap_EarningsPerShareDiluted_0C0ED40729A971EC60660A167FB37973" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_SeveranceTerminationCostsNetOfTax" xlink:label="loc_int_SeveranceTerminationCostsNetOfTax_C05E3E833F0B366A76090A167FB388DC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_B3BAFD51231BE9E1392D0A167FB3CC72" xlink:to="loc_int_SeveranceTerminationCostsNetOfTax_C05E3E833F0B366A76090A167FB388DC" xlink:type="arc" />
    <link:loc xlink:href="int-20161130.xsd#int_SeveranceTerminationCostsImpactOnBasicAndDilutedEarningsPerShare" xlink:label="loc_int_SeveranceTerminationCostsImpactOnBasicAndDilutedEarningsPerShare_D6AF6BB2F307CDD6F2F50A167FB30D9F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_B3BAFD51231BE9E1392D0A167FB3CC72" xlink:to="loc_int_SeveranceTerminationCostsImpactOnBasicAndDilutedEarningsPerShare_D6AF6BB2F307CDD6F2F50A167FB30D9F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnauditedTables" xlink:type="extended" />
</link:linkbase>
