1586, from M.Fr.
imposteur, from L.L.
impostorem (nom.
impostor), agent noun from
impostus, collateral form of
impositus, pp. of
imponere "place upon, impose upon, deceive," from
in- "in" +
ponere "to put place" (see
position).
Imposture "act of willfully deceiving others" first recorded 1537.