deviant

[dee-vee-uh nt] /ˈdi vi ənt/
adjective
1.
deviating or departing from the norm; characterized by deviation:
deviant social behavior.
noun
2.
a person or thing that deviates or departs markedly from the accepted norm.
Origin
1350-1400; Middle English < Late Latin dēviant- (stem of dēviāns, present participle of dēviāre to deviate), equivalent to Latin dē- de- + vi(a) road, way + -ant- -ant
Related forms
nondeviant, adjective, noun
Can be confused
deviant, deviate.
British Dictionary definitions for deviant

deviant

/ˈdiːvɪənt/
adjective
1.
deviating, as from what is considered acceptable behaviour
noun
2.
a person whose behaviour, esp sexual behaviour, deviates from what is considered to be acceptable
Word Origin and History for deviant
adj.

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 in Medicine

deviant de·vi·ant (dē'vē-ənt)
adj.
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.

de'vi·ance or de'vi·an·cy n.