(topology) A group which is also a topological space and whose group operations are continuous functions.

(mathematics) A group whose elements are precisely all of the bijections of some set with itself and whose operation is composition of those bijections.

A group of musicians who regularly perform rock music together.

plural of rock group

A blood type.

(topology) For a specified topological space, the group whose elements are homotopy classes of loops (images of some arbitrary closed interval whose endpoints are both mapped to a designated point) and whose group operation is concatenation.

plural of age group

A pop group made up of (usually attractive) young women.

A musical group specializing in pop music.

plural of ethnic group