- threesome⇄adj. consisting or composed of three; performed by three together; threefold; triple.
- threesome⇄noun 1. a group or set of three people.
2a. a game or match played by three people.
b. (Golf.) a match of three players using only two balls in which one player plays against the other two, each of whom takes alternate strokes at the second - threesome⇄threesome, noun, adjective.