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impost (n.)

"tax, duty," 1560s, from French impost (15c., Modern French impôt), from Medieval Latin impostum "a tax imposed," noun use of neuter of Latin impostus, contracted form of impositus, past participle of imponere "to place upon, impose upon" (see impostor). Compare depot. As an architectural term, 1660s, from French imposte (16c.), from Italian imposta, from the same Latin source.

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Definitions of impost from WordNet

impost (n.)
money collected under a tariff;
Synonyms: customs / customs duty / custom
impost (n.)
the lowest stone in an arch -- from which it springs;
Synonyms: springer
From wordnet.princeton.edu