polygamy

noun
🔊/pəˈlɪɡəmi/
🔊/pəˈlɪɡəmi/
[uncountable] (specialist)
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  1. the custom of having more than one wife at the same time一夫多妻(制) compare polyandry
    Word Originlate 16th cent.: from French polygamie, via late Latin from Greek polugamia, from polugamos ‘often marrying’.