Concubinage Legal Definition: Civil law term for an unmarried couple living nonetheless as husband and wife or, where same-sex relationships are recognized by law, such similar cohabitation relationships. The Civil Code of France 2009, §515-8, defines concubinage as follows: "Concubinage is an union in fact, characterized by a life in common offering a character of stability and continuity, between two persons, of different sexes or of the same sex, who live in couple." This is the French civil law system's equivalent to what the common law would refer to as a common law relationship or cohabitation relationship. Also, in French, l'union de fait. Categories & Topics: Duhaime's Civil Law Dictionary Duhaime's Family Law Dictionary Unless otherwise noted, this page was written by Lloyd Duhaime of Duhaime.org Always looking up definitions? Save time with our search provider (modern browsers only) If you find an error or omission in Duhaime's Law Dictionary, or if you have suggestion for a legal term, we'd love to hear from you!