Douglas Harper's Etymology Dictionary
Wiktionary
a. 1 Following one of various practices of having relationships with multiple partners, with the knowledge and consent of all involved. 2 Having personal beliefs regarding relationships that are compatible with polyamory, regardless of one's experience or current practices.
Wikipedia
"Polyamorous" is the first single by American post-grunge/ alternative metal band Breaking Benjamin from their debut album Saturate.
Usage examples of "polyamorous".
Throughout the following chapters, Friday proceeds to establish an informal polyamorous group that includes Ian, Freddie, both of their wives, and several others.
In addition to being polyamorous, non-procreative, and bisexual, Friday has also thrown any trace of marriage to the wind, roaming ever farther from Rubin's circle of traditional sexuality.
Friday breaks free of the ship and flees to a colony planet, where, by amazing coincidence and the heavy hand of the author, she is reunited with Ian, Freddie, and her other polyamorous partners.
While Heinlein hints that polyamorous liaisons continue to occur, they are now quietly swept under the rug.