: a group of musicians who perform instrumental music using mostly stringed instruments
: the front part of the main floor in a theater
Word History of ORCHESTRA
In ancient Greek plays the chorus danced and sang in a space in front of the stage. The Greek name for this space was orchēstra, which came from the verb orcheisthai, “to dance.” The English word orchestra came from the Greek word for the space in front of a stage. At first the English word was used to refer to such a space but is now used to mean “the front part of the main floor.” In today's theaters a group of musicians often sits in the space in front of the stage. Such a group, too, came to be called an orchestra.