I. ˈim-ˌpōst noun
Etymology: Middle French, from Medieval Latin impositum, from Latin, neuter of impositus, past participle of imponere
Date: 1568
: something imposed or levied : tax
II. noun
Etymology: French imposte, ultimately from Latin impositus
Date: 1664
: a block, capital, or molding from which an arch springs — see arch illustration