/ məˈnɒgəmi; NAmE məˈnɑːg-/ noun [ U ]
1.
the fact or custom of being married to only one person at a particular time
—compare bigamy , polygamy
2.
the practice or custom of having a sexual relationship with only one partner at a particular time
► mon·og·am·ous / məˈnɒgəməs; NAmE məˈnɑːg-/ adjective :
a monogamous marriage
Most birds are monogamous.
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WORD ORIGIN
early 17th cent.: from French monogamie , via ecclesiastical Latin from Greek monogamia , from monos single + gamos marriage.