Compersion 

A feeling of joy when a loved one invests in and takes pleasure from another romantic or sexual relationship.

Commentary: Compersion can be thought of as the opposite of "jealousy;" it is a positive emotional reaction to a loved one's other relationship. The term was coined by the Kerista Commune. It differs from candaulism in that compersion does not specifically refer to joy regarding the sexual activity of one's partner, but refers instead to joy at the relationship with another romantic and/or sexual partner. It is analagous to the feeling of joy a parent feels when their children marry or that best friends feel for each other when they are happy in a romantic relationship.

I feel compersion when I see my husband come home happy from spending time with his girlfriend. His happiness brings me happiness

Compersion by Joreth April 8, 2010

compersion 

Often a term used among polyamorous (openly nonmonogamous) people. Often called the antonym of jealousy. Seeing your partner/s get a crush on, hook up with, fall in love with, or in any other way romantically bond with other people, and feeling deep happiness, joy, and love for them.

"You're in love with Parker, don't you feel jealous that he's started dating Emily?"
"Actually, no, I feel compersion. She's really cool. He lights up to see her. When I see him that happy, I actually feel happy for him, not jealous."

compersion by nomadak March 10, 2010

Compersion 

Love your lover's lover for they too love your lover

Love is multiplicative, compersion in nature. Love in its whole is much greater than the sum of the discrete pairings.

Compersion by HoneyBunsofSteel October 25, 2020

Comperson 

A man or woman who feels compersion, i.e., pleasure associated with one's partner romantic or sexual pleasure with another and is often called the opposite of jealousy. Since these persons know and enjoy their partners' pleasure with others, these partners are technically not Cuckolds or Cuckqueans since infidelities or unfaithfulness are not involved.

The comperson enjoyed his wife telling him about her sex dates.

Comperson by Soaul July 4, 2022

Compersionate 

The practice of feeling of joy or happiness in seeing your partner share other romantic relationships. Adjective of "Compersion."

"I wish my metamour could be a little more compersionate."

"My partner was very compersionate about my date with my other partner tonight!"

Compersionate by StarrNoir September 7, 2018

compersion 

Taking pleasure or joy in the action of your partner engaging in a similar romantic or sexual relationship with another person.
See also polyamory

The opposite of jealousy is compersion.

compersion by sparklejess December 31, 2004

Tim Commerford 

Tim Commerford (also known as Timmy C.) is the Bassist for the famous L.A. based Rap-Metal band Rage Against the Machine and the now defunct super-group AudioSlave. Tim is also argued to be one of the greatest bass players of the last two decades.

Fan 1 : Tim Commerford is awesome on the new Rage Against the Machine album!

fan 2: hell yeah!

Tim Commerford by MAtt95 May 16, 2011