metamour

[met-uh-moor]

noun

1. (among polyamorous people) a romantic or sexual partner of one's own romantic or sexual partner.

   I'm not dating her, but she's my boyfriend's girlfriend, so we are metamours.

Word History and Origins

Origin of metamour¹

First recorded in 1995–2000; meta- ( def. ) + (par)amour ( def. )

Example Sentences

A "metamour" refers to your partner's partner, and "compersion" refers to a sense of happiness you feel for a partner who is happy with another partner.

From Salon

Some people define “metamour” as a partner of our partners, whom we have a non-sexual and non-romantic relationship with.

From Slate