1. (n.) Three parts acting together; a set of three\; three united.

2. (n.) A composition for three parts or three instruments.

3. (n.) 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.

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 threesome tierce trefoil trey triad 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