com-PER-sion
Compersion is the feeling of joy or happiness that arises when someone you love experiences connection, happiness, or love with another person. It is often described as the opposite of jealousy, though the two are not mutually exclusive and can coexist. The word originated in the polyamorous community in the late 1980s and has no equivalent in mainstream relational vocabulary.
Compersion is frequently held up as the emotional ideal of plural relationship life, which creates a certain amount of pressure and confusion around it. The way it gets discussed can make it sound like a destination you arrive at once you have done enough personal growth work. In practice, it is more like a capacity that develops over time and shows up unevenly depending on the relationship, the circumstance, and what else is happening in your life.
When compersion is present, it tends to feel like warmth or even delight at a partner's happiness with someone else. Seeing them light up about a new connection. Hearing them come home energized. Knowing they are being cared for in ways you cannot always provide. The feeling does not require the absence of other feelings. It is entirely possible to feel both compersion and a kind of wistfulness or longing at the same time, and both of those are honest responses to a real situation.
What compersion is not: a performance, an obligation, or evidence of having transcended normal human feeling. People who do not feel it readily are not failing at polyamory. People who feel it reliably have usually developed that capacity through genuine practice and real experience, not through willpower or ideological commitment.
The most useful frame is probably this: compersion is a skill and a practice, not a personality trait. Some people come to it more naturally than others. Everyone can work toward it, and working toward it is not the same as arriving at it.
Compersion is sometimes conflated with indifference or not caring what a partner does, which is a misread. Compersion is an active positive feeling, not the absence of feeling. It is also sometimes used as social pressure: "you should be feeling compersion, not jealousy." That framing is not useful and not what the term means.
The Level tends to experience compersion most reliably, having developed it through years of practice. The Current feels it most acutely in the early phases of a partner's new connection. The Keystone sometimes struggles with it when a partner's new relationship shifts the relational center of gravity.
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definition contributed by Tessakin