fornication
1. [ noun ] (sexuality) voluntary sexual intercourse between persons not married to each other
Related terms: extramarital_sex fornicate
2. [ noun ] (sexuality) extramarital sex that willfully and maliciously interferes with marriage relations
Synonyms: criminal_conversation adultery
Examples:

"adultery is often cited as grounds for divorce"

Related terms: extramarital_sex
Similar spelling:   formication
  fornicate
  fornicator
  fornicatress
  formic_acid
  formicate