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adultery

noun [U]
 
 
/əˈdʌl.tər.i/ US  /-t̬ɚ.i/

Definition

sex between a married man or woman and someone he or she is not married to: Many people in public life have committed adultery.Infidelity in relationships adulterous
 
 
/əˈdʌl.tər.əs/ US  /-t̬ɚ-/ adjective
He had an adulterous relationship with his wife's best friend.Disloyalty, betrayal and treasonInfidelity in relationships
(Definition of adultery noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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