1) Part of a theatre 2) Radio City section 3) Theater area 4) Where the winds blow 
The sunken area in front of the stage where the orchestra play during a performance. Also The Pit. 
[n] - lowered area in front of a stage where an orchestra accompanies the performers
noun lowered area in front of a stage where an orchestra accompanies the performers
The area below the stage, usually, where the orchestra is situated. The conductor is on a podium in the orchestra pit, visible to the singers on stage, the orchestra in the pit and occasionally to the audience.
The area jutting out from beneath the stage, where the orchestra is to be found.
The sunken area in front of the stage where the orchestra plays.