A group is a

number A number is a mathematical object used to count, measure, and label. The most basic examples are the natural numbers 1, 2, 3, 4, and so forth. Numbers can be represented in language with number words. More universally, individual numbers can ...

of persons or things that are located, gathered, or classed together.

Groups of people

Cultural group An ethnographic group or ethnocultural group is a group that has cultural traits that make it stand out from the larger ethnic group it is a part of. In other words, members of an ethnographic group will also consider themselves to be members of a ...

, a group whose members share the same cultural identity *

Ethnic group An ethnicity or ethnic group is a group of people with shared attributes, which they collectively believe to have, and long-term endogamy. Ethnicities share attributes like language, culture, common sets of ancestry, traditions, society, re ...

, a group whose members share the same ethnic identity * Religious group (disambiguation), a group whose members share the same religious identity *

Social group In the social sciences, a social group is defined as two or more people who interact with one another, share similar characteristics, and collectively have a sense of unity. Regardless, social groups come in a myriad of sizes and varieties. F ...

, a group whose members share the same social identity * Tribal group, a group whose members share the same tribal identity *

Organization An organization or organisation (English in the Commonwealth of Nations, Commonwealth English; American and British English spelling differences#-ise, -ize (-isation, -ization), see spelling differences) is an legal entity, entity—such as ...

, an entity that has a collective goal and is linked to an external environment *

Peer group In sociology, a peer group is both a social group and a primary group of people who have similar interests ( homophily), age, background, or social status. Members of peer groups are likely to influence each others' beliefs and behaviour. Durin ...

, an entity of three or more people with similar age, ability, experience, and interest * Class (education), a group of people which attends a specific course or lesson at an educational institution

Social science

* In-group and out-group * Primary, secondary, and reference groups *

* Collectives

Philosophy and religion

* Khandha, a Buddhist concept of five material and mental factors that take part in the rise of craving and clinging

Science and technology

Mathematics

Group (mathematics) In mathematics, a group is a Set (mathematics), set with an Binary operation, operation that combines any two elements of the set to produce a third element within the same set and the following conditions must hold: the operation is Associative ...

, a set together with a binary operation satisfying certain algebraic conditions

Chemistry

Functional group In organic chemistry, a functional group is any substituent or moiety (chemistry), moiety in a molecule that causes the molecule's characteristic chemical reactions. The same functional group will undergo the same or similar chemical reactions r ...

, a group of atoms which provide some property to a molecule * Group (periodic table), a column in the periodic table of chemical elements

Computing and the Internet

* Group (computing), a collection of users or other objects * Group (database) * Group (online social networking) * Usenet newsgroup * Google Groups * Yahoo! Groups * Facebook groups

Other uses in science and technology

Group (stratigraphy) In geology, a group is a lithostratigraphy, lithostratigraphic Stratigraphic unit, unit consisting of a series of related Geological formation, formations that have been classified together to form a group. Formations are the fundamental unit of ...

, 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 A language family is a group of languages related through descent from a common ancestor, called the proto-language of that family. The term ''family'' is a metaphor borrowed from biology, with the tree model used in historical linguistics ...

Other uses

* 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 An army group is a military organization consisting of several field army, field armies, which is self-sufficient for indefinite periods. It is usually responsible for a particular geographic area. An army group is the largest field organizatio ...

* Militia groups * Rebel groups * Terrorist groups * Group (military unit), an air force formation *

Corporate group A corporate group, company group or business group, also formally known as a group of companies, is a collection of parent and subsidiary corporations that function as a single economic entity through a common source of control. These types of gr ...

, a group of affiliated companies * Group psychotherapy, sometimes colloquially known as "group" *

Musical ensemble A musical ensemble, also known as a music group, musical group, or a band is a group of people who perform Instrumental music, instrumental and/or vocal music, with the ensemble typically known by a distinct name. Some music ensembles consist ...