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Noun: fornication  ,for-nu'key-shun
Usage: vulgar
  1. Voluntary sexual intercourse between persons not married to each other
  2. Extramarital sex that wilfully and maliciously interferes with marriage relations
    "fornication is often cited as grounds for divorce";
    - adultery, criminal conversation

Derived forms: fornications

Type of: extramarital sex, free love

Encyclopedia: Fornication