aberration (n.) Look up aberration at Dictionary.com
1590s, "a wandering, act of straying," from Latin aberrationem (nominative aberratio) "a wandering," noun of action from past participle stem of aberrare "to wander out of the way, lose the way, go astray," literally and figuratively, from ab- "away" (see ab-) + errare "to wander, stray, roam, rove" (see err). Meaning "deviation from the normal type" first attested 1846.