Definition of adultery noun from the Oxford Advanced American Dictionary

 

adultery

 noun
noun
NAmE//əˈdʌltəri//
 
[uncountable]
 
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sex between a married person and someone who is not their husband or wife He was accused of committing adultery.
NAmE//əˈdʌltərəs//
 
adjective an adulterous relationship
See the Oxford Advanced Learner's Dictionary entry: adultery