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pervert (v.)

late 14c., perverten (transitive), "to turn someone aside from a right religious belief to a false or erroneous one; to distort natural order, misdirect misapply (justice, law, truth, etc.); to turn (something or someone) from right opinion or conduct," from Old French pervertir "pervert, undo, destroy" (12c.) and directly from Latin pervertere "overthrow, overturn," figuratively "to corrupt, subvert, abuse," literally "turn the wrong way, turn about," from per "away" (see per) + vertere "to turn, turn back, be turned; convert, transform, translate; be changed" (from PIE root *wer- (2) "to turn, bend").

Related: Perverted; perverting. Replaced native froward, which embodies the same image. Old English had mishweorfed "perverted, inverted," an identical formation to the Latin word using native elements.

pervert (n.)

1660s, "one who has forsaken a doctrine or system regarded as true, an apostate," from pervert (v.). Psychological sense of "one who has a perversion of the sexual instinct" is attested from 1897 (Havelock Ellis), originally especially of homosexuals.

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Definitions of pervert from WordNet
1
pervert (v.)
corrupt morally or by intemperance or sensuality;
Synonyms: corrupt / subvert / demoralize / demoralise / debauch / debase / profane / vitiate / deprave / misdirect
pervert (v.)
practice sophistry; change the meaning of or be vague about in order to mislead or deceive;
Synonyms: twist / twist around / convolute / sophisticate
pervert (v.)
change the inherent purpose or function of something;
Synonyms: misuse / abuse
2
pervert (n.)
a person whose behavior deviates from what is acceptable especially in sexual behavior;
Synonyms: deviant / deviate / degenerate
From wordnet.princeton.edu