Etymology
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polygyny (n.)

1780, "condition of having many wives, marriage or cohabitation of one man with more than one woman at the same time," from Greek polygynēs "having many wives," from polys "many" (see poly-) + gynē "woman, wife" (from PIE root *gwen- "woman"). Related: Polygynous.

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Definitions of polygyny

polygyny (n.)
polygamy in which a man has more than one wife at a time;
From wordnet.princeton.edu