Aberration (noun)

A deviation from what is normal, typical, or expected; a departure from the usual or typical behavior, idea, or condition.

Origin:

Late latin aberration-, aberratio deviation, from latin aberrare to stray, from ab- + errare to wander.

Examples:

1. His behavior was an aberration from his usual calm and rational behavior.
2. The company's recent financial losses were considered an aberration.
3. The sudden change in her personality was an aberration.
4. The aberration in the data was caused by a measurement error.
5. The storm's path was an aberration from the usual weather patterns.