OSO
n.— «“Polyamory is never having to say you’ve broken up,’’ said Sally Amsbury of Oakland, whose sex and love life openly includes her husband and two “other significant others,” known in polyamory parlance as “OSOs.”» —“Committed to marriage for the masses Polyamorists say they relate honestly to multiple partners” by Don Lattin San Francisco Chronicle (California) Apr. 20, 2004. (source: Double-Tongued Dictionary)
Further reading
If you speak a second or third language, you may remember the first time you dreamed in that new tongue. But does this milestone mean you’re actually fluent? And a couple’s dispute over the word regret: Say you wish you’d been able...