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non·mo·nog·a·mous | \ ˌnän-mə-ˈnä-gə-məs 
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\Definition of nonmonogamous
: not of, relating to, or practicing monogamy : not monogamous
nonmonogamous couples a nonmonogamous relationship
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Time Traveler for nonmonogamous
The first known use of nonmonogamous was in 1887
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