polygamy
noun/pəˈlɪɡəmi/
/pəˈlɪɡəmi/
[uncountable] (specialist)- the custom of having more than one wife or husband at the same time compare polyandryWord Originlate 16th cent.: from French polygamie, via late Latin from Greek polugamia, from polugamos ‘often marrying’.
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polygamy