Entry 3 senses Webster, 1913 Monogamous /mən-äg'-əm-əs/ · Mo·nog·a·mous · IPA /məˈnɑɡəməs/ 01 a. Upholding, or practicing, monogamy. 1. Upholding, or practicing, monogamy. 2. Same as Monogamian.(Bot.) See: Monogamian 3. Mating with but one of the opposite sex; -- said of birds and mammals.(Zool.)