sororate

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Related to Sororate marriage: Levirate marriage

so·ror·ate

 (sə-rôr′ĭt)
n.
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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

sororate

(ˈsɒrəˌreɪt)
n
(Anthropology & Ethnology) the custom in some societies of a widower marrying his deceased wife's younger sister
[C20: from Latin soror a sister]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

so•ror•ate

(ˈsɔr əˌreɪt, ˈsoʊr-)

n.
marriage with a wife's sister, as following the wife's death.
[1905–10; < Latin soror sister]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.