ex ‧ tra ‧ mar ‧ i ‧ tal /ˌekstrəˈmærətl◂, ˌekstrəˈmærɪtl◂/ BrE AmE adjective [only before noun]
an extramarital sexual relationship is one that a married person has with a person who is not their husband or wife
ex ‧ tra ‧ mar ‧ i ‧ tal /ˌekstrəˈmærətl◂, ˌekstrəˈmærɪtl◂/ BrE AmE adjective [only before noun]
an extramarital sexual relationship is one that a married person has with a person who is not their husband or wife
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012