What is the musical definition of ensemble?

What is the musical definition of ensemble?
A musical ensemble is a group of people who perform instrumental or vocal music, typical known by a distinct name.

In classical music, trios, or quartets either blend the sounds of musical instrument families (such as piano, strings, and wind instruments) or group together instruments from the same instrument family, such as string ensemble or wind ensembles.

In jazz ensembles, the instruments typically include wind instruments (one or more saxophones, trumpets, etc.)

In rock ensembles, usually called rock bands, there are usually guitars and keyboards and a rhythm section made up of bass guitar and drum kit.