<?xml version="1.0" encoding="US-ASCII"?>
<!-- Generated by Broadridge Transform (tm) - http://www.broadridge.com -->
<!-- Created: Fri Aug 28 20:47:41 UTC 2026 -->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#SeriesOnly" roleURI="http://xbrl.sec.gov/oef/role/SeriesOnly"/>
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ClassOnly" roleURI="http://xbrl.sec.gov/oef/role/ClassOnly"/>
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#RiskOnly" roleURI="http://xbrl.sec.gov/rr/role/RiskOnly"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all"/>
  <definitionLink xlink:role="http://xbrl.sec.gov/oef/role/SeriesOnly" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_S000054372Member" xlink:href="ck0001529390-20260430.xsd#ck0001529390_S000054372Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0001529390_S000054372Member" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_S000066874Member" xlink:href="ck0001529390-20260430.xsd#ck0001529390_S000066874Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0001529390_S000066874Member" order="12" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_S000066876Member" xlink:href="ck0001529390-20260430.xsd#ck0001529390_S000066876Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0001529390_S000066876Member" order="13" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:role="http://xbrl.sec.gov/oef/role/ClassOnly" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="oef_ShareClassDomain" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_C000170794Member" xlink:href="ck0001529390-20260430.xsd#ck0001529390_C000170794Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0001529390_C000170794Member" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_C000215250Member" xlink:href="ck0001529390-20260430.xsd#ck0001529390_C000215250Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0001529390_C000215250Member" order="12" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_C000215252Member" xlink:href="ck0001529390-20260430.xsd#ck0001529390_C000215252Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0001529390_C000215252Member" order="13" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:role="http://xbrl.sec.gov/rr/role/RiskOnly" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="oef_AllRisksMember" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AllRisksMember"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_CyberSecurityRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_CyberSecurityRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_CyberSecurityRiskMember" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_DepositaryReceiptsRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_DepositaryReceiptsRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_DepositaryReceiptsRiskMember" order="12" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_EquityInvestingRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_EquityInvestingRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_EquityInvestingRiskMember" order="13" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_ETFStructureRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_ETFStructureRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_ETFStructureRiskMember" order="14" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_ForeignInvestmentRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_ForeignInvestmentRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_ForeignInvestmentRiskMember" order="15" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_InvestmentRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_InvestmentRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_InvestmentRiskMember" order="16" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_LargeCapitalizationCompanyRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_LargeCapitalizationCompanyRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_LargeCapitalizationCompanyRiskMember" order="17" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_ManagementRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_ManagementRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_ManagementRiskMember" order="18" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_MarketEventsRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_MarketEventsRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_MarketEventsRiskMember" order="19" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_MicroCapitalizationCompanyRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_MicroCapitalizationCompanyRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_MicroCapitalizationCompanyRiskMember" order="20" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_PortfolioTurnoverRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_PortfolioTurnoverRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_PortfolioTurnoverRiskMember" order="21" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_PrivateEquityCorrelationRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_PrivateEquityCorrelationRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_PrivateEquityCorrelationRiskMember" order="22" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_PrivateEquityInvestingStyleRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_PrivateEquityInvestingStyleRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_PrivateEquityInvestingStyleRiskMember" order="23" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_QuantitativeSecuritySelectionRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_QuantitativeSecuritySelectionRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_QuantitativeSecuritySelectionRiskMember" order="24" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_SectorRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_SectorRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_SectorRiskMember" order="25" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_SmallAndMediumCapitalizationCompanyRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_SmallAndMediumCapitalizationCompanyRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_SmallAndMediumCapitalizationCompanyRiskMember" order="26" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_VentureCapitalCorrelationRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_VentureCapitalCorrelationRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_VentureCapitalCorrelationRiskMember" order="27" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_VentureCapitalInvestingStyleRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_VentureCapitalInvestingStyleRiskMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_VentureCapitalInvestingStyleRiskMember" order="28" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0001529390_StaleInformationRiskMember" xlink:href="ck0001529390-20260430.xsd#ck0001529390_StaleInformationRiskMember"/>
<!-- [WMV7][zZH9mmw2kZPn4aAaSqrMfa05tNySvdgH6C/lOMdSrFy9ZdAPH38FxeZshAYBEWy1QoPg9NlrCZUfVPeQtai6NoQ+63Ew+l3buuhFQkCb7PDsSHaUABIasWtFCCBPC45tcz0z00kuOo8UJdrWV93fLVGY+WSd1A8ILzOpfTFzqhW03zlwe4wIPGKPQAdnLfLWBH5FKdyMWrAdnPf1eTHZUe+R4vCr7Qo+2BRnUCf3DdrgiIE7LNkOWo6Wl+TqKt/PYPv/oi1gJL+Jy6rcootr6OzQ8VuZagNW2fIe/hDmP1qw0uBUjo93xCbOBmWNmuLOs7Lm6TUwq0FGVUf2Uf1Ic1YNgNqzahnIDnw=] CSR-->
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0001529390_StaleInformationRiskMember" order="29" xbrldt:closed="true"/>
  </definitionLink>
</linkbase>
