English to English
noun
- voluntary sexual intercourse between persons not married to each other
source: WordNet 3.0
- extramarital sex that willfully and maliciously interferes with marriage relations
Adultery is often cited as grounds for divorce.
source: WordNet 3.0
- Unlawful sexual intercourse on the part of an unmarried person; the act of such illicit sexual intercourse between a man and a woman as does not by law amount to adultery.
source: Webster 1913