polyamory

Etymology

From poly- (from Ancient Greek πολύς (polús, “many”)) + Latin amor (“love”) + -y.

noun

1. Any of various practices involving romantic or sexual relationships with multiple partners with the knowledge and consent of all involved.
   Some of these are poly intimacy, polyamory, polygamy, omnigamy, multimate, multiple adult relationship, combo, cellular family, expanded family, nonexclusive relationship, intimate friendship and inclusive relationship. 1992, Deborah M. Anapol, Love without limits, page 4