1) Cohabitation 2) French word used in English 3) Living together 
Concubinage is an interpersonal relationship in which a person (usually a woman) engages in an ongoing sexual relationship with another person (usually a man) to whom they are not or cannot be married. The inability to marry may be due a multiplicity of factors, such as differences in social rank (including sex slave status), an extant marriage, r...
• (n.) A plea, in which it is alleged that the woman suing for dower was not lawfully married to the man in whose lands she seeks to be endowed, but that she was his concubine. • (n.) The cohabiting of a man and a woman who are not legally married; the state of being a concubine.
the state of cohabitation of a man and a woman without the full sanctions of legal marriage. The word is derived from the Latin con (`with`) and ... [3 related articles]
Cohabitation of a man with one or more women who do not have the full status of a wife. Concubines were permitted in ancient Greece and their children were legitimate if recognized by their fathers....
Cohabitation of a man and a woman more uxorio (as if they were husband and wife) outside of religious marriage
Con·cu'bi·nage noun 1. The cohabiting of a man and a woman who are not legally married; the state of being a concubine. » In some countries, concubinage is marriage of an inferior kind, or performed with less solemnity than a true or formal marriage; or marriage with a woman of in...
[n] - cohabitation without being legally married
concubinage 1. The state of cohabiting or living together as man and wife while not married. 2. The state of being a concubine.
noun cohabitation without being legally married
cohabitation of a man and woman without legal or formal marriage. · the state or practice of being a concubine.