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impostor

[im-pos-ter] /ɪmˈpɒs tər/
noun
1.
a person who practices deception under an assumed character, identity, or name.
Origin of impostor
1580-1590
1580-90; < Late Latin, equivalent to Latin impos(i)-, variant stem of impōnere to deceive, place on (see impone) + -tor -tor
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for impostor

impostor

/ɪmˈpɒstə/
noun
1.
a person who deceives others, esp by assuming a false identity; charlatan
Word Origin
C16: from Late Latin: deceiver; see impose
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for impostor
n.

1580s, from Middle French imposteur (16c.), from Late Latin impostor, agent noun from impostus, collateral form of impositus, past participle of imponere "place upon, impose upon, deceive," from assimilated form of in- "into, in, on, upon" (see in- (2)) + ponere "to put place" (see position).

Online Etymology Dictionary, © 2010 Douglas Harper
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