Source : Webster's Revised Unabridged Dictionary (1913)

Imposture \Im*pos"ture\, n. [L. impostura: cf. F. imposture. See
   {Impone}.]
   The act or conduct of an impostor; deception practiced under
   a false or assumed character; fraud or imposition; cheating.

         From new legends And fill the world with follies and
         impostures.                              --Johnson.

   Syn: Cheat; fraud; trick; imposition; delusion.

Source : WordNet®

imposture
     n : pretending to be another person [syn: {impersonation}]