fornication
for·ni·ca·tion
noun
1.
voluntary sexual intercourse between persons not married to each other
2.
extramarital sex that willfully and maliciously interferes with marriage relations
- “adultery is often cited as grounds for divorce”
Origin
From Middle English fornicacioun, from Old French fornicacion, from Latin fornicātiō, from fornix (“brothel”).
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Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.