ABERRATION

[noun] - a temporary change from the typical or usual way of behavingIn a moment of aberration, she agreed to go with him. [U]I'm sorry I'm late - I had a mental aberration and forgot we had a meeting today. [C]He said that the decline in the company's sales last month was just a temporary aberration. [C]There is an aberration (= a fault) in the computer program. [C]