1. Irregularity; deviation; inconsistency: A flaw (defect or fault) in a lens that doesn't focus properly is called a spherical aberration.
2. Oddity; abnormalities; incongruity: The new rules were confusing and full of aberrations.
3. Quirk, eccentricity, peculiarity; Emanuel's only aberration was an occasional lapse of memory.
3. A deviation from the norm: The heat this summer was definitely an aberration from what people expected.

The extreme wide-spread cold weather with snow and ice that some areas had this winter was an aberration.

4. Etymology: from Latin aberrationem, aberratio. "a wandering, a straying"; from the stem of aberrare. "to wander out of the way, to lose the way, to go astray"; from ab-, "away" + errare, "to wander".