1.Musica. A large group of musicians who play together on various instruments, usually including strings, woodwinds, brass instruments, and percussion instruments. b. The instruments played by such a group. 2. The area in a theater or concert hall where the musicians sit, immediately in front of and below the stage. 3a. The front section of seats nearest the stage in a theater. b. The entire main floor of a theater. 4. A semicircular space in front of the stage used by the chorus in ancient Greek theaters.
ETYMOLOGY:
Latin orchstra, the space in front of the stage in Greek theaters where the chorus performed, from Greek orkhstr, from orkheisthai, to dance.