orchestra (orchestras plural )
1 n-count An orchestra is a large group of musicians who play a variety of different instruments together. Orchestras usually play classical music.
oft in names
...the Royal Liverpool Philharmonic Orchestra.
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chamber orchestra
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symphony orchestra
2 n-sing The orchestra or the orchestra seats in a theatre or concert hall are the seats on the ground floor directly in front of the stage. (mainly AM) usu the N, N n in BRIT, usually use stalls
chamber orchestra (chamber orchestras plural )A chamber orchestra is a small orchestra which plays classical music. n-count
orchestra pit
In a theatre, the orchestra pit is the space reserved for the musicians playing the music for an opera, musical, or ballet, immediately in front of or below the stage. n-sing
symphony orchestra (symphony orchestras plural )A symphony orchestra is a large orchestra that plays classical music. n-count; n-in-names