Etymology
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threesome (n.)

late 14c., from three + -some (2).

updated on July 27, 2022

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Definitions of threesome from WordNet

threesome (n.)
three people considered as a unit;
Synonyms: trio / triad / trinity
threesome (n.)
the cardinal number that is the sum of one and one and one;
Synonyms: three / " / iii / trio / tierce / leash / troika / triad / trine / trinity / ternary / ternion / triplet / tercet / terzetto / trey / deuce-ace
From wordnet.princeton.edu, not affiliated with etymonline.