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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.