Trio

n.	1.	Three, considered collectively; three in company or acting together; a set of three; three united. The trio were well accustomed to act together, and were linked to each other by ties of mutual interest. - Dickens.
	2.	(Mus.) A composition for three parts or three instruments.

Noun	1.	trio - the cardinal number that is the sum of one and one and one Synonyms: 3, deuce-ace, III, tercet, ternary, ternion, terzetto, three, threesome, trey, triad, trine, trinity, triplet, troika, tierce, leash
	2.	trio - a musical composition for three performers
	3.	trio - three performers or singers who perform together
	4.	trio - a set of three similar things considered as a unit Synonyms: triad, triplet
	5.	trio - three people considered as a unit Synonyms: threesome, triad, trinity

German band, Nachtmusik, Philharmonic, absolute music, adaptation, air varie, aleatory, aleatory music, arrangement, band, big band, bipartisanship, brass, brass band, brass choir, brass quintet, brass section, brasses, callithumpian band, chamber music, chamber orchestra, clover, coaction, coadjuvancy, coadministration, coagency, cochairmanship, codirectorship, collaboration, collaborativeness, collectivism, collusion, combo, commensalism, common effort, common enterprise, communalism, communism, communitarianism, community, complicity, composition, concert, concert band, concord, concordance, concurrence, cooperation, cooperativeness, descant, desks, deuce-ace, dixieland band, duet, duettino, duo, duumvirate, ecumenicalism, ecumenicism, ecumenism, electronic music, ensemble, ensemble music, ensemble singing, esprit, esprit de corps, etude, exercise, fellow feeling, fellowship, gamelan orchestra, group, harmonization, harmony, incidental music, instrumental music, invention, jazz band, joining of forces, joint effort, joint operation, jug band, leash, mass action, military band, morale, mutual assistance, mutualism, mutuality, nocturne, octet, opus, orchestra, orchestration, part music, part singing, part song, piece, polyphonic music, pooling, pooling of resources, production, program music, pulling together, quartet, quintet, ragtime band, reciprocity, ricercar, rock-and-roll group, score, septet, septuor, sestet, set of three, sextet, shamrock, skiffle band, solidarity, sonata, sonatina, steel band, street band, string band, string choir, string orchestra, string quartet, strings, study, swing band, symbiosis, symphony, symphony orchestra, synergism, synergy, team spirit, teamwork, tercet, ternary, ternion, terzet, terzetto, theme and variations, three, tierce, trefoil, trey, trialogue, triangle, tricorn, trident, triennium, trihedron, trilogy, trimester, trine, trinity, trinomial, triphthong, triple, triple crown, triple threat, triplet, triplex, triplopy, tripod, triptych, trireme, triseme, triskelion, trisul, triumvirate, triune, triunity, trivet, troika, united action, variation, waits, woodwind, woodwind choir, woodwind quartet, woodwinds, work