Definition of adulterous adjective from the Oxford Advanced Learner's Dictionary

 

adulterous

 adjective
adjective
BrE BrE//əˈdʌltərəs//
 
; NAmE NAmE//əˈdʌltərəs//
 
 
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involving sex between a married person and somebody who is not their husband or wife; (of a married person) having sex with somebody who is not their husband or wife an adulterous relationship adulterous wives/husbands