polygamy /pəˈlɪgəmi/ noun Learner's definition of POLYGAMY
[noncount]
: the state or practice of being married to more than one person at the same time一夫多妻(制);一妻多夫(制);多配偶(制) — compare monogamy — polygamist
/pəˈlɪgəmɪst/ noun, plural polygamists [count] — polygamous
/pəˈlɪgəməs/ adjective