A metamour is the partner of one's partner in 📝polyamory — someone connected through a shared partner, but with whom one shares no direct romantic or sexual relationship.
Metamours can vary widely in the level of connection they share — from close friendships to minimal or no contact, depending on the preferences and boundaries of those involved. The shape of the metamour relationship is determined less by social convention than by the styles of relating each metamour brings to it. In 📝Kitchen Table Polyamory, metamours often socialize and form their own bonds; in 📝Parallel Polyamory, they may barely interact at all.
The metamour role is frequently discussed in 📝Consensual Non-Monogamy (CNM) literature as a site of 📝compersion, boundary-setting, and interpersonal communication. Healthy metamour dynamics tend to require a particular kind of trust — not the trust between romantic partners, but the trust that two people sharing a third are each operating in good faith. When that's present, metamour relationships can be among the most unexpected friendships polyamory produces.
Within a 📝Polycule, metamours form the connective tissue that makes a relationship network feel like a network rather than a set of unrelated dyads. Even when metamours have no direct relationship, their existence shapes the texture of every connection they're adjacent to — through shared scheduling, shared partners' emotional weather, and the simple fact of knowing someone else loves the person you love.