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<!-- DFIN New ActiveDisclosure (SM) XBRL Linkbase Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date :2021-11-12T09:18:39.0927+00:00 -->
<!-- Copyright (c) 2021 Donnelly Financial Solutions, Inc. All Rights Reserved. -->
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    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="flyw_CommitmentsAndContingenciesDisclosureLineItems" xlink:to="us-gaap_AreaOfLand" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="flyw_CommitmentsAndContingenciesDisclosureTable" xlink:to="srt_StatementGeographicalAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="country_RO" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_SegmentGeographicalDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="flyw_CommitmentsAndContingenciesDisclosureLineItems" xlink:to="us-gaap_LesseeOperatingLeaseOptionToExtend" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="country_SG" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="flyw_CommitmentsAndContingenciesDisclosureLineItems" xlink:to="flyw_LesseeOperatingLeaseExtensionCommenceDate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="flyw_CommitmentsAndContingenciesDisclosureLineItems" xlink:to="us-gaap_LeaseAndRentalExpense" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="flyw_CommitmentsAndContingenciesDisclosureLineItems" xlink:to="flyw_LesseeOperatingLeaseCommenceDate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="flyw_CommitmentsAndContingenciesDisclosureLineItems" xlink:to="us-gaap_LeaseExpirationDate1" priority="2" use="optional"/>
  </link:definitionLink>
</link:linkbase>
