1. n.1 a tax, duty, or tribute.
2 a weight carried by a horse in a handicap race.
Etymology: F f. med.L impost- part. stem of L imponere: see IMPOSE 2. n. the upper course of a pillar, carrying an arch.
Etymology: F imposte or It. imposta fem. past part. of imporre f. L imponere: see IMPOSE