/ ɪmˈpɒstʃə(r); NAmE -ˈpɑːs-/ noun
[ U , C ] ( formal ) an act of tricking people deliberately by pretending to be sb else
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WORD ORIGIN
mid 16th cent.: via French from late Latin impostura , from Latin imposit- imposed upon, from the verb imponere inflict, deceive (from in- in, upon + ponere put).