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, the relationship between one co-wife and another, in respect to their children.
In polygamy, a wife of one's father who is not one's mother; that is, co-wife of one's mother.
A woman present at the christening of a baby who promises to help raise the child in a Christian manner; a female godparent who sponsors the baptism of a child.
To act as godmother to.