po·lyg·a·my
noun/pəˈlɪɡəmi/
/pəˈlɪɡəmi/
[uncountable] (specialist)- the custom of having more than one wife or husband at the same time
同时拥有多个妻子或丈夫的习俗 Word Originlate 16th cent.: from French polygamie, via late Latin from Greek polugamia, from polugamos ‘often marrying’.