A unit or group of complementary parts that contribute to a single effect, especially:
A coordinated outfit or costume.
A coordinated set of furniture.
A group of musicians, singers, dancers, or actors who perform together: an improvisational theater ensemble; a woodwind ensemble.
A work for two or more vocalists or instrumentalists.
The performance of such a work.
Music
A work for two or more vocalists or instrumentalists.
The performance of such a work.
[French, from Old French, together, from Late Latin īnsimul, at the same time : in-, intensive pref.; see in-2 + simul, at the same time; see sem-1 in Indo-European roots.]