An ensemble is a group of things or people acting or taken together as a whole. The term is used in various contexts, including music, theater, and physics. Here are some examples of what an ensemble can refer to:

• Music: In music, an ensemble is a group of musicians who perform together, such as a jazz ensemble or a chamber orchestra.

• Theater: In theater, an ensemble can refer to a group of actors, dancers, or performers who work together to create a production. An ensemble cast is one that comprises many principal actors and performers who are typically assigned roughly equal amounts of screen time.

• Physics: In physics, specifically statistical mechanics, an ensemble is an idealization consisting of a large number of virtual copies of a system, considered all at once, each of which represents a possible state that the real system might be in. The concept of an ensemble was introduced by J. Willard Gibbs in 1902).

Overall, an ensemble is a group of individuals or things that work together to create a unified whole.