the custom in some cultures of marrying the younger sister of one's wife, esp. after the wife's death
Origin of sororateModern Latin from Classical Latin soror, sister + -ate
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.
Origin of sororateFrom Latin soror sister ; see sororal .
(usually uncountable, plural sororates)