'Trio' definitions:

Definition of 'trio'

From: WordNet
noun
The cardinal number that is the sum of one and one and one [syn: three, 3, III, trio, 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 [syn: trio, triad, triplet, triple]
noun
Three people considered as a unit [syn: trio, threesome, triad, trinity]

Definition of 'Trio'

From: GCIDE
  • Trio \Tri"o\, n. [It., fr. L. tres, tria, three: cf. F. trio, from the Italian. See Three.]
  • 1. Three, considered collectively; three in company or acting together; a set of three; three united. [1913 Webster]
  • The trio were well accustomed to act together, and were linked to each other by ties of mutual interest. --Dickens. [1913 Webster]
  • 2. (Mus.) (a) A composition for three parts or three instruments. (b) The secondary, or episodical, movement of a minuet or scherzo, as in a sonata or symphony, or of a march, or of various dance forms; -- not limited to three parts or instruments. [1913 Webster] Triobolar

Synonyms of 'trio'

From: Moby Thesaurus