Orchestra (noun)

1. A large ensemble of musicians playing mainly classical music, typically with instruments including strings, brass, and percussion.
2. The area in a concert hall reserved for the performers in an orchestra.

Origin:

Late 17th century: from french orchestre, or via latin from greek orkhestra, denoting a place for dancing, later a band of dancers.

Examples:

1. The symphony orchestra played a beautiful concert last night.
2. The new conductor has revitalized the sound of the orchestra.
3. The orchestra has added several new members to the ensemble.
4. The audience was mesmerized by the beautiful music from the orchestra.
5. The concert hall has a large orchestra pit for the musicians.