Group

A group is a number of persons or things that are located, gathered, or classed together.

Groups of people

Cultural group, a group whose members share the same cultural identity
Ethnic group, a group whose members share the same ethnic identity
Religious group (disambiguation), a group whose members share the same religious identity
Social group, a group whose members share the same social identity
Tribal group, a group whose members share the same tribal identity
Organization, an entity that has a collective goal and is linked to an external environment
Peer group, an entity of three or more people with similar age, ability, experience, and interest

Group (mathematics), a set together with a binary operation satisfying certain algebraic conditions

Group (stratigraphy), in geology, consisting of formations or rock strata
Cultivar group, in biology, a classification category in the International Code of Nomenclature for Cultivated Plants
Galaxy groups and clusters, in cosmology
Group (firearms), the grouping of shots from a firearm
Language group, a unit of classification within a Language family

Breed Groups (dog), the group or category to which breeds of dogs are assigned by kennel clubs
Group (auto racing), a category of car allowed to compete in auto racing
Army group
Militia groups
Rebel groups
Terrorist groups
Group (military unit), an air force formation
Corporate group, a group of affiliated companies
Group psychotherapy, sometimes colloquially known as "group"
Musical ensemble

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