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The custom of marriage of a man to his wife's sister or sisters, usually after the wife has died or is unable to conceive a child.
[From Latin soror, sister; see sororal.]
(Anthropology & Ethnology) the custom in some societies of a widower marrying his deceased wife's younger sister
[C20: from Latin soror a sister]
so•ror•ate(ˈsɔr əˌreɪt, ˈsoʊr-)
marriage with a wife's sister, as following the wife's death.
[1905–10; < Latin soror sister]