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c.1400, from Late Latin deviantem (nominative devians), present participle of deviare "turn aside," from Latin phrase de via, from de "off" (see de-) + via "way" (see via). The noun meaning "one that deviates" is from late 15c.; in the sexual sense, from 1952; also deviate (n.), recorded since 1912.
deviant de·vi·ant (dē'vē-ənt)
Differing from a norm or from the accepted standards of a society. n.
One that differs from a norm, especially a person whose behavior and attitudes differ from accepted social standards.