threesome

[ three-suh m ]
/ ˈθri səm /

adjective

consisting of three; threefold.
performed or played by three persons.

noun

three forming a group.
something in which three persons participate, as certain games.
Golf. a match in which two players, playing alternately with one ball, compete against a third player who also plays one ball.

Origin of threesome

First recorded in 1325–75, threesome is from the Middle English word thresum. See three, -some2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for threesome

threesome
/ (ˈθriːsəm) /

noun

a group of three
golf a match in which a single player playing his own ball competes against two others playing alternate strokes on the same ball
any game, etc, for three people
(modifier) performed by threea threesome game
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012