n. & v.
n. 1 a musical performance of usu. several separate compositions. 2 agreement, accordance, harmony. 3 a combination of voices or sounds.
v.tr. arrange (by mutual agreement or coordination). concert-goer a person who often goes to concerts. concert grand the largest size of grand piano, used for concerts. concert-master esp. US the leading first-violin player in some orchestras. concert overture Mus. a piece like an overture but intended for independent performance. concert performance Mus. a performance (of an opera etc.) without scenery, costumes, or action. concert pitch 1 Mus. the pitch internationally agreed in 1960 whereby the A above middle C = 440 Hz. 2 a state of unusual readiness, efficiency, and keenness (for action etc.). in concert 1 (often foll. by with) acting jointly and accordantly. 2 (predic.) (of a musician) in a performance.
[ F concert (n.), concerter (v.) f. It. concertare harmonize ]