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3.
Your partner's other partners, that you are not romantically or sexually involved with. My girl/boyfriend's other boy/girlfriends.

A partner has several other partners. Each partner of a partner is a metamour. Collectively they are all metamours. Often used in polyamorous communities.
I'm dating F. He also has a partner J and another partner Z. J and Z are my metamours. We practice polyamory.
von Wednesdey 26. November 2010
 
1.
Literally, meta = with; about + amor = love. The partner of one's partner, with whom one does not share a direct sexual or loving relationship
My wife's boyfriend is my metamour
von Joreth 8. April 2010
 
2.
In a polyamorous relationship, where your lover has more than one lover, a metamour is the name given to your partner's other lover(s).
My partner and I went to see her metamour Jane at the weekend.
von Rick Mills 19. Juli 2004