Aberration
/ˌæbəˈreɪʃən/
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Definition
(noun) The act of wandering; deviation from truth, moral rectitude; abnormal; divergence from the straight, correct, proper, normal, or from the natural state.
Sentence Examples
It wasn't an aberration.
Owing to a strange mental aberration, Tom forgot his own name.
CEFR Practice Quiz
The low test score was an ____ in his otherwise excellent record.