1. (v. t.) To plan together; to settle or adjust by conference, agreement, or consultation.

2. (v. t.) To plan; to devise; to arrange.

3. (v. i.) To act in harmony or conjunction; to form combined plans.

4. (v. t.) Agreement in a design or plan; union formed by mutual communication of opinions and views; accordance in a scheme; harmony; simultaneous action.

5. (v. t.) Musical accordance or harmony; concord.

6. (n.) A musical entertainment in which several voices or instruments take part.

Philharmonic concert acclamation accompaniment accord accordance act in concert act together affiliate affinity agreement agreement of all alliance ally amalgamate argue arrange assent associate association attune attunement band band concert band together be in league bipartisanship cahoots calculate cast chamber concert chime chiming chorus club together co-working coact coaction coadjuvancy coadministration coagency coalesce cochairmanship codirectorship coherence coincide coincidence collaborate collaboration collaborativeness collectivism collectivity collude collusion combination combine combined effort commensalism common assent common consent common effort common enterprise communalism communism communitarianism community compatibility complicity concentus concert concerted action concomitance concord concordance concourse concur concurrence confederate confluence conformance conformation conformity congeniality congruence congruency congruity conjunction consensus consensus gentium consensus of opinion consensus omnium consent consentaneity consilience consistency consolidate consonance consonancy consort conspiracy conspire contrive cooperate cooperation cooperativeness correspondence cut out debate design devise diapason discuss do business with dramatico-musical duet duumvirate ecumenicalism ecumenicism ecumenism equivalence esprit esprit de corps euphony federate fellow feeling fellowship figure forecast frame fuse general acclamation general agreement general consent general voice get heads together get together go partners hang together harmonics harmonize harmony heavy harmony hold together homophony hook up instrumental intend intersection jazz jazzy join join in join together joining of forces joint effort joint operation junction keep together lay plans league league together like-mindedness make a projection make arrangements make common cause mass action meeting of minds merge methodize monochord monody morale musical performance musical program mutual assistance mutual understanding mutualism mutuality octet one accord one voice oneness orchestral organize overlap parallelism parasitism partner peace performance philharmonic plan plan ahead play ball pooling pooling of resources pop concert pops popular concert prearrange program program of music project prom promenade concert pull together pulling together put heads together quartet quintet rapport rationalize reciprocate reciprocity recital rock same mind saprophytism schedule schematize self-consistency septet service of music set up settle sextet shape simultaneity single voice solidarity stand together swing symbiosis symmetry symphonic symphony symphony concert sync synchronism synchronization syncopated synergism synergy systematize tally team spirit team up teamwork three-part harmony throw in together tie in tie up timing total agreement trio