n.

1. 管弦乐队[C][G]
   The orchestra played a Mozart symphony.

   乐队演奏了一首莫扎特的交响曲。

   He is a violoncellist in a symphony orchestra.

   他是交响乐团中的大提琴手。

2. （剧场中的）乐队席[C]
3. 管弦乐器[C]
4. 【美】（剧场的）楼下座位；（一楼前方的）头等座位[C]

n.

1. [treated as sing. or pl.] a group of instrumentalists, especially one combining string, woodwind, brass, and percussion sections.
2. (also orchestra pit) the part of a theatre where the orchestra plays, typically in front of the stage and on a lower level.
3. N. Amer. the stalls in a theatre.
4. the semicircular space in front of an ancient Greek theatre stage where the chorus danced and sang.