Co-mother meaning

In polygamy, a wife of one's father who is not one's mother; that is, co-wife of one's mother.
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In polygamy, the relationship between one co-wife and another, in respect to their children.
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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.
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Origin of co-mother

  • com- +‎ mother, as calque of Latin commater, French commère

    From Wiktionary