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

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 three a threesome game