group

A number of things or persons being in some relation to one another.

"A group of people gathered in front of the Parliament to demonstrate against the Prime Minister's proposals."

A set with an associative binary operation, under which there exists an identity element, and such that each element has an inverse.

An effective divisor on a curve.

A (usually small) group of people who perform music together.

"Did you see the new jazz group?"

To put together to form a group.

"group the dogs by hair colour"

To come together to form a group.