In polygamy, the relationship between one co-wife and another, in respect to their children.
In a lesbian couple, the nonbirth mother (partner of the birth mother) of a child, especially one who takes an equal role in mothering the child.
In polygamy, a wife of one's father who is not one's mother; that is, co-wife of one's mother.
In a polygamous marriage, a woman who is simultaneously the sister and co-wife of another.
A woman who is simultaneously sister and wife to her spouse.
A co-wife in general.