(1) In modern theaters, the ground-floor area on the first floor where the audience sits to watch the play; (2) in classical Greek theaters, a central circle where the chorus performed

c. 1600, "area in an ancient theater for the chorus," from Latin orchestra, from Greek orkhestra, semicircular space where the chorus of dancers performed, with suffix -tra denoting place + [..]

A large group of instrumentalists playing together.

large group of musicians. Strings, woodwinds, brass, and percussion are parts of an orchestra.

a musical organization consisting of a group of instrumentalists including string players seating on the main floor in a theater (orchestral) relating to or composed for an orchestra; "or [..]

in classical Greek theater, a semicircular area used mostly for dancing by the chorus.

 – the part of the stage where the orchestra performs generally in a lower section in front of the stage; from “the dancing place” in Ancient Greek Theater

orkester

Belonging to an orchestra and playing, foretells pleasant entertainments, and your sweetheart will be faithful and cultivated. To hear the music of an orchestra, denotes that the knowledge of humanity will at all times prove you to be a much-liked person, and favors will fall unstintedly upon you.   

(n) a musical organization consisting of a group of instrumentalists including string players(n) seating on the main floor in a theater

N F area in front of stage; (Greek| held chorus; Roman| seats for senators/VIPs)

a large instrumental ensemble.

a performance group of diverse instruments; in Western music, an ensemble of multiple string parts with various woodwind, brass, and percussion parts.

   A large group of instruments (generally from thirty to a hundred or more players) that includes instruments from the string (bowed string). woodwind, brass. and percussion families, as well as piano, harp. and other instruments as required for a particular composition.

An orchestra is a large group of instruments that play together.

The group of musicians who, led by the conductor, accompany the singers

lang=en 1800s=1843 * '''1843''' — . ''''. *: In came a fiddler with a music-book, and went up to the lofty desk, and made an orchestra of it, and tuned like fifty stomach-aches.