- 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. - Adultery. - Incest. - Idolatry.
Meaning of 'fornication' (Princeton's WordNet)
1 . fornication
[ n]
Meaning (1): - extramarital sex that willfully and maliciously interferes with marriage relations