(mathematics) A group of isometries leaving a fixed point.

A group of people, sampled from a larger population, interviewed in open session for market research or political analysis.

plural of ethnic group

An algebraist who specializes in group theory

(US, Canada) A collection of residents representing a geographic or otherwise connected residential or business area who together ensure that their communities development interests are known, represented and supported.

A group of members of a political party or of a similar organisation who have decided to create their own organisation.

plural of group theorist

A group of people who informally support each other over a problem which all members share.

plural of splinter group

A collection of humans or animals who share certain characteristics, interact with one another, accept expectations and obligations as members of the group, and share a common identity.