mo ‧ nog ‧ a ‧ my /məˈnɒɡəmi $ məˈnɑː-/ BrE AmE noun [uncountable]
[ Date: 1600-1700 ; Language: French ; Origin: monogamie , from Late Latin , from Greek , from mono- ( ⇨ ↑ mono- ) + gamos 'marriage' ]
1 . the custom of being married to only one husband or wife ⇨ bigamy , polygamy
2 . when a person or animal has a sexual relationship with only one partner:
Monogamy is rare in most animal groups, but is common among birds.
—monogamous adjective :
We live in a monogamous society.
—monogamously adverb