Something, such as a tax or duty, that is imposed.
Sports The weight a horse must carry in a handicap race.
[Obsolete French, from Old French, from Medieval Latin impostum, from Latin, neuter of impostus, variant of impositus, past participle of impōnere, to place upon; see impose.]
im·post 2 (ĭm'pōst') n. The uppermost part of a column or pillar supporting an arch.
[French imposte, from Italian imposta, from Latin, feminine past participle of impōnere, to place upon; see impose.]