1. a tax; tribute; duty.
  2. a customs duty.
  3. Horse Racing. the weight assigned to a horse in a race.

verb (used with object)

  1. to determine customs duties on, according to the kind of imports.


  1. a tax, esp a customs duty
  2. horse racing the specific weight that a particular horse must carry in a handicap race


  1. (tr) US to classify (imported goods) according to the duty payable on them


  1. architect a member at the top of a wall, pier, or column that supports an arch, esp one that has a projecting moulding

“tax, duty,” 1560s, from Middle French impost, from Medieval Latin impostum, from neuter of Latin impostus, contracted from impositus, past participle of imponere (see impostor).

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