Definition of monogamous
: relating to, characterized by, or practicing monogamy : having only one mate, spouse, or sexual partner at one time
… the beaver has several qualities that endear it to people: it is monogamous and lives in a family unit; it is gentle and clean; it is absolutely industrious.— Doug Hand But for women who are not at risk for STDs because they are in mutually monogamous relationships, modern IUDs can be safe and very effective.— Kim Painter There are many kinds of infidelity, but here we are talking about a sexual infidelity in monogamous marriage or a relationship that is tantamount to marriage.— Frank Pittman
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Merriam-Webster unabridged
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Time Traveler for monogamous
The first known use of monogamous was in 1770
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