Meaning of “adultery” in the English Dictionary

"adultery" in British English

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adulterynoun [ U ]

uk /əˈdʌl.tər.i/ us /əˈdʌl.tɚ.i/
adulterous
adjective uk /əˈdʌl.tər.əs/ us /əˈdʌl.tɚ.əs/

He had an adulterous relationship with his wife's best friend.

(Definition of “adultery” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"adultery" in American English

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adulterynoun [ U ]

us /əˈdʌl·tə·ri, -tri/

sex between a married person and someone who is not that person’s wife or husband

adulterous
adjective us /əˈdʌl·tər·əs, -trəs/

an adulterous relationship

(Definition of “adultery” from the Cambridge Academic Content Dictionary © Cambridge University Press)