(n.) The cohabiting of a man and a woman who are not legally married; the state of being a concubine.
(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.
Example Sentences:
(1) If that sounded vaguely familiar to British ears, maybe it’s because this combination of invisibility (the shadow cabinet), protective segregation (women-only carriages) and concubinage (legalised prostitution) seems to be the sort of arrangement that Corbyn is groping dimly towards.
(2) Polygamy and concubinage are still widely practiced throughout Africa.
Concubinary
Definition:
(a.) Relating to concubinage; living in concubinage.