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.

An algebraist who specializes in group theory

plural of group theorist

(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.

(topology) Any group that is a smooth manifold and whose group operations are differentiable.

(chemistry) In the periodic table of the elements, any of the eight groups (columns) of elements that contain the lightest (and most common) elements.

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

plural of support group

plural of functional group

plural of rock group