Etymology
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impostor (n.)

1580s, "swindler, cheat," from French imposteur (16c.), from Late Latin impostor "a deceiver," agent noun from impostus, contraction of impositus, past participle of imponere "place upon, impose upon, deceive," from assimilated form of in- "into, in, on, upon" (from PIE root *en "in") + ponere "to put, place" (past participle positus; see position (n.)). Meaning "one who passes himself off as another" is from 1620s. Related: Impostrous. For a fem. form, Bacon uses French-based impostress (1610s) while Fuller, the church historian, uses Latinate impostrix (1650s).

updated on December 08, 2020

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Definitions of impostor from WordNet

impostor (n.)
a person who makes deceitful pretenses;
Synonyms: imposter / pretender / fake / faker / fraud / sham / shammer / pseudo / pseud / role player
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.