Definition of aberration noun from the Oxford Advanced American Dictionary

 

aberration

 noun
noun
NAmE//ˌæbəˈreɪʃn//
 
[countable, uncountable](formal)
 
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a fact, an action, or a way of behaving that is not usual, and that may be unacceptable a temporary aberration of his exhausted mind A childless woman was once regarded as an aberration, almost a social outcast.
See the Oxford Advanced Learner's Dictionary entry: aberration