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Definition of Co-mother
1. Noun. (obsolete) the relationship of a godmother to the other god-parents, and the legal parents, of a child. ¹
2. Noun. in polygamy, a wife of one's father who is not one's mother; that is, co-wife of one's mother ¹
3. Noun. in polygamy, the relationship between one co-wife and another, in respect to their children ¹
4. Noun. 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 ¹
¹ Source: wiktionary.com