impost

impost is a   Noun

Definition:

[1] That which is imposed or levied; a tax, tribute, or duty; especially, a duty or tax laid by goverment on goods imported into a country. Even the ship money . . . Johnson could not pronounce to have been an unconstitutional impost. Macaulay.

[2] The top member of a pillar, pier, wall, etc., upon which the weight of an arch rests.

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