That attack is looking disturbingly more like a sign of things to come than an aberration.
The Shalit trade is not an aberration, but a reflection of Israeli insularity that has grown stronger in recent months and years.
His actions may have been an aberration but his thinking, sadly, is not.
1590s, "a wandering, 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," from ab- "away" (see ab-) + errare "to wander" (see err). Meaning "deviation from the normal type" first attested 1846.
aberration ab·er·ra·tion (āb'ə-rā'shən)
A departure from the normal or typical.
A psychological disorder or abnormal alteration in one's mental state.
A defect of focus, such as blurring in an image.
An imperfect image caused by a physical defect in an optical element, as in a lens.
A deviation in the normal genetic structure or number of chromosomes in an organism.