: the fact or an instance of deviating or being aberrant especially from a moral standard or normal state
: something or someone regarded as atypical and therefore able be ignored or discounted
- Harkins was to be regarded as an aberration among American military leaders …
- —Neil Sheehan
- The U.S. establishment treated this grassroots movement almost as an aberration, virtually ignoring it.
- —Helen Caldicott
- As for Putin's desire to lay waste to Chechnya, Western leaders largely dismiss it as an aberration …
- —The New Republic
: failure of a mirror, refracting surface, or lens to produce exact point-to-point correspondence between an object and its image
- … the telescope suffers from a serious focusing problem, a condition known as spherical aberration, which causes the point-like images of stars to be surrounded by fuzzy haze.
- —M. Mitchell Waldrop
: a small periodic change of apparent position in celestial bodies due to the combined effect of the motion of light and the motion of the observer
They react, often in anger, to particular decisions but tend to regard them as aberrational rather than systemic failures.
—Robert H. Bork