THREESOME
trio, threesome, triad, trinity
(noun) three people considered as a unit
three, III, trio, threesome, tierce, leash, troika, triad, trine, trinity, ternary, ternion, triplet, tercet, terzetto, trey, deuce-ace
(noun) the cardinal number that is the sum of one and one and one
Source: WordNet® 3.1
Etymology
Noun
threesome (plural threesomes)
A group of three people or things.
An instance of sexual activity involving three people.
Synonyms
• (group of three people): triad, trine, trinity, trio, troika, triumvirate; see also trio
• (sexual activity): ménage à trois, troilism
Anagrams
• motherese
Source: Wiktionary