- A number of individuals or things considered together because of similarities: a small group of supporters across the country.
- A military unit consisting of two or more battalions and a headquarters.
- A class or collection of related objects or entities, as:
- A stratigraphic unit, especially a unit consisting of two or more formations deposited during a single geologic era.
- Of, relating to, constituting, or being a member of a group: a group discussion; a group effort.