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aberrant (adj.)

"wandering from the usual course," 1798, originally in natural history, "differing somewhat from a group in which it is placed," from Latin aberrantem (nominative aberrans), present participle of aberrare "to wander away, go astray," literally and figuratively, from ab "off, away from" (see ab-) + errare "to wander, stray, roam, rove" (see err). Related: Aberrance; aberrancy (1660s). The verb aberrate is rare.

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Definitions of aberrant from WordNet
1
aberrant (n.)
one whose behavior departs substantially from the norm of a group;
2
aberrant (adj.)
markedly different from an accepted norm;
aberrant behavior
Synonyms: deviant / deviate
From wordnet.princeton.edu