trio

(noun) the cardinal number that is the sum of one and one and one. Synonyms: three, 3, III, threesome, tierce, leash, troika, triad, trine, trinity, ternary, ternion, triplet, tercet, terzetto, trey, deuce-ace.

(noun) a musical composition for three performers.

(noun) three performers or singers who perform together.

(noun) a set of three similar things considered as a unit. Synonyms: triad, triplet, triple.

(noun) three people considered as a unit. Synonyms: threesome, triad, trinity.