GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Impostor , n. [L. impostor a deceiver, fr. imponere to impose upon, deceive. See Impone.] One who imposes upon others; a person who assumes a character or title not his own, for the purpose of deception; a pretender. “The fraudulent impostor foul.”  
   Milton.
   Syn. -- Deceiver; cheat; rogue. See Deceiver.
   1913 Webster