Dictionary.com
Thesaurus.com

polyamorous vs. monogamous

[pol-ee-am-er-uhs] / ˌpɒl iˈæm ər əs /

adjective

  1. noting or relating to polyamory, the practice or condition of participating simultaneously in more than one serious romantic or sexual relationship with the knowledge and consent of all partners.

[muh-nog-uh-muhs] / məˈnɒg ə məs /

adjective

  1. practicing or advocating monogamy.

  2. of or relating to monogamy.