Etymology
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perversion (n.)

late 14c., "action of turning aside from truth; corruption, distortion" (originally of religious beliefs), from Latin perversionem (nominative perversio) "a turning about," noun of action from past-participle stem of pervertere (see pervert (v.)). Psychological sense of "disorder of sexual behavior in which satisfaction is sought through channels other than those of normal heterosexual intercourse" is from 1892, originally including homosexuality.

Perversions are defined as unnatural acts, acts contrary to nature, bestial, abominable, and detestable. Such laws are interpretable only in accordance with the ancient tradition of the English common law which ... is committed to the doctrine that no sexual activity is justifiable unless its objective is procreation. [A.C. Kinsey, et.al., "Sexual Behavior in the Human Male," 1948]

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Definitions of perversion

perversion (n.)
a curve that reverses the direction of something;
perversion also shows up in kinky telephone cords
the tendrils of the plant exhibited perversion
perversion (n.)
an aberrant sexual practice;
Synonyms: sexual perversion
perversion (n.)
the action of perverting something (turning it to a wrong use);
it was a perversion of justice
From wordnet.princeton.edu