term:

Concubinage

concubinage n

: the relationship between persons who are cohabiting without the benefit of marriage used esp. in the civil law of Louisiana compare common-law marriage NOTE: Under Louisiana law, concubinage does not give rise to any rights in the parties to each other's property.

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.