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English definition of “adultery”

adultery

noun [U] uk   /əˈdʌl.tər.i/ us    /-t̬ɚ.i/
sex between a married man or woman and someone he or she is not married to: Many people in public life have committed adultery.
adulterous
adjective uk   /əˈdʌl.tər.əs/ us    /-t̬ɚ-/
He had an adulterous relationship with his wife's best friend.
(Definition of adultery from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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