noun
aberration
ab-uh-RAY-shuhn/ˌæbəˈreɪʃn/
A departure from what is normal or expected.
One crooked tile is an aberration in the otherwise straight pattern.

Etymology
An aberration was originally a wandering away from a path. That image became a departure from the normal or expected course, rather than necessarily a physical loss of direction.
In context
Some of the officials at Florida Housing say that this was a one-time thing, this was an aberration.
More examples
- The analyst treats the sudden spike as an aberration.
- One rude remark was an aberration in his otherwise courteous behavior.
- The technician checks the lens for optical aberrations.
Forms
aberration · aberrations