GNU Collaborative International Dictionary of English

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1.       
   Impost , n. [OF. impost, F. impot, LL. impostus, fr. L. impostus, p. p. of imponere to impose. See Impone.]
   That which is imposed or levied; a tax, tribute, or duty; especially, a duty or tax laid by government on goods imported into a country.
   1913 Webster
   Even the ship money . . . Johnson could not pronounce to have been an unconstitutional impost.
   Macaulay.
   
   1913 Webster
   (Arch.) The top member of a pillar, pier, wall, etc., upon which the weight of an arch rests.
   1913 Webster
   ☞ The impost is called continuous, if the moldings of the arch or architrave run down the jamb or pier without a break.
   Syn. -- Tribute; excise; custom; duty; tax.
   1913 Webster