A number of individuals or things considered together because of similarities: a small group of supporters across the country.
Linguistics A category of related languages that is less inclusive than a family.
A military unit consisting of two or more battalions and a headquarters.
A unit of two or more squadrons in the U.S. Air Force, smaller than a wing.
A class or collection of related objects or entities, as:
Two or more atoms behaving or regarded as behaving as a single chemical unit.
A column in the periodic table of the elements.
A stratigraphic unit, especially a unit consisting of two or more formations deposited during a single geologic era.
Mathematics A set with a binary associative operation such that the operation admits an identity element and each element of the set has an inverse element for the operation.
Of, relating to, constituting, or being a member of a group: a group discussion; a group effort.
To place or arrange in a group: grouped the children according to height.
To belong to or form a group: The soldiers began to group on the hillside.