"fornication" in the noun sense
1. fornication
voluntary sexual intercourse between persons not married to each other
2. adultery, criminal conversation, fornication
extramarital sex that willfully and maliciously interferes with marriage relations
"adultery is often cited as grounds for divorce"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License