wife. A married woman; a woman who has a lawful husband living.
common-law wife. 1. The wife in a common-law marriage; a woman who contracts an informal marriage with a man and then holds herself out to the community as being married to him. See common-law marriage under MARRIAGE(1).2.Archaic. Loosely, a concubine.
plural wife.One of two or more women married simultaneously to the same man in a
polygamous marriage.
[Blacks Law 8th]