n. 25B6; noun (formal) EXTRAMARITAL SEX, extramarital relations, adultery, infidelity, unfaithfulness, cuckoldry; informal hanky-panky, a bit on the side.
FORNICATION
Meaning of FORNICATION in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012