"Orchestra:  a term, dating (in modern times) from the late 17th c[entury], for an instrumental ensemble, usu[ally] restricted to mean an ensemble composed of a section of bowed strings with more than one player to a part along with woodwind, brass and percussion instruments [...]  The modern symphony orchestra usually contains from 40 to 100 players."—Thank you, Philip D. Morehead, for The New American Dictionary of Music, Dutton, 1991, p.385.  Thank you, Jill Goff, for access to the library from which this book was borrowed.