aberration

• n. 失常；离开正路，越轨
GRE

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aberration (n.)
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.
1. Single people are treated as an aberration and made to pay a supplement.

2. It became very clear that the incident was not just an aberration, it was not just a single incident.

3. The removal of the chromatic aberration is then of primary importance.

4. The resultant defect is known as chromatic aberration.

5. One of the principal advantages of the reflecting glass is its complete freedom from chromatic aberration.