Definition of Impostor

Babylon English Dictionary
one who pretends to be something he is not in order to deceive others, impersonator, pretender (also imposter)
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Impostor Definition from Arts & Humanities Dictionaries & Glossaries
JM Latin-English Dictionary
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impostor
Impostor Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
One who imposes upon others; a person who assumes a character or title not his own, for the purpose of deception; a pretender.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

impostor
\im*pos"tor\ (?), 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."

The Devil's Dictionary
Impostor, (n.)

A rival aspirant to public honors.
  
The Devil's Dictionary, by Ambrose Bierce, 1911 (About)
WordNet 2.0

Noun
1. a person who makes deceitful pretenses
(synonym) imposter, pretender, fake, faker, fraud, sham, shammer, pseudo, pseud, role player
(hypernym) deceiver, cheat, cheater, trickster, beguiler, slicker
(hyponym) name dropper
Impostor Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
An impostor or imposter is a person who pretends to be somebody else, often to try to gain financial or social advantages through social engineering, but just as often for purposes of espionage or law enforcement.

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