impostor (inp-), ōris, m. [impono, II. B. 3.],
a deceiver , impostor (post-class.; cf.: planus, sycophanta), impostores aut mendaces aut litigiosi, Dig. 21, 1, 4, § 3; Hier. Ep. 38 fin. ; 54, 5; Paul. Nol. Carm. 21, 338.
·noun One who imposes upon others; a person who assumes a character or title not his own, for the pu...
Webster's Dictionary of the English Language