Wiktionary
n. (context music US English) The first violin in a symphony orchestra; normally plays violin solos
Wikipedia
The Concertmaster (from the German Konzertmeister) is the second-most significant person in an orchestra, symphonic band or other musical ensemble after the conductor or director. Another common term in the U.S. is "First Chair." In the U.K., the term commonly used is "leader."
Usage examples of "concertmaster".
Was the concertmaster actually intending to marry Bellini and had she ever been divorced from Ochs?
There was no reason for Cedric to speak of me to Jacques, even if it were the done thing for a trombonist to play tattletale to the concertmaster, which I assure you Jacques-Marie Houdon would not permit.
He closed the open score on the podium, glanced down at the concertmaster, and raised his baton.
Schubert walked from the wings to take his place beside the organ, bow and shake the hand of the concertmaster, and walk back to the wings.
You have to have it if you expect to move in the circles she aspires to, which, for now, would be concertmaster with a middling philharmonic orchestra.
Rozsa waved to the orchestra, which caused the cheering to continue, and then to the concertmaster of the orchestra, the first fiddle.