1. n- A large group of musicians including: Brass, Strings, Percussion, Wood-Winds. An Orchestra differs from a Band which does not include Wood-Winds.
Image courtesy of Portland Symphony Orchestra.
2. adj- The main seating area in a Proscenium
on the ground
Image Courtesy of Queen Elizabeth Theatre
3. n- Historically, the actual stage
floor of a classic Greek theater. Originally a "threshing floor" the Orchestra was used for ceremonial dances to celebrate the Harvest. Later as these ceremonies became more organized They evovled into the Dionyssian Festivals which, in turn, gave rise to The Theatre
as we know it today.
This image courtesy of Walter Englert, Reed University