Definitions of impost
  1. noun
    money collected under a tariff
    synonyms: custom, customs, customs duty
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    ship money
    an impost levied in England to provide money for ships for national defense
    type of:
    duty, tariff
    a government tax on imports or exports
  2. noun
    the lowest stone in an arch -- from which it springs
    synonyms: springer
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    type of:
    building material consisting of a piece of rock hewn in a definite shape for a special purpose
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