from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An assemblage of persons or objects gathered or located together; an aggregation: a group of dinner guests; a group of buildings near the road.
  • n. Two or more figures that make up a unit or design, as in sculpture.
  • n. A number of individuals or things considered together because of similarities: a small group of supporters across the country.
  • n. Linguistics A category of related languages that is less inclusive than a family.
  • n. A military unit consisting of two or more battalions and a headquarters.
  • n. A unit of two or more squadrons in the U.S. Air Force, smaller than a wing.
  • n. A class or collection of related objects or entities, as:
  • n. Two or more atoms behaving or regarded as behaving as a single chemical unit.
  • n. A column in the periodic table of the elements.
  • n. A stratigraphic unit, especially a unit consisting of two or more formations deposited during a single geologic era.
  • n. 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.
  • adj. Of, relating to, constituting, or being a member of a group: a group discussion; a group effort.
  • transitive v. To place or arrange in a group: grouped the children according to height.
  • intransitive v. To belong to or form a group: The soldiers began to group on the hillside.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A number of things or persons being in some relation to one another.
  • n. A set with an associative binary operation, under which there exists an identity element, and such that each element has an inverse.
  • n. A (usually small) group of people who perform music together.
  • n. A small number (up to about fifty) of galaxies that are near each other.
  • n. A column in the periodic table of chemical elements.
  • n. A functional entity consisting of certain atoms whose presence provides a certain property to a molecule, such as the methyl group.
  • n. A subset of a culture or of a society.
  • n. An air force formation.
  • n. A collection of formations or rock strata.
  • n. In the Unix operating system, a number of users with same rights with respect to accession, modification, and execution of files, computers and peripherals.
  • n. An element of an espresso machine from which hot water pours into the portafilter.
  • v. To put together to form a group.
  • v. To come together to form a group.

from the GNU version of the Collaborative International Dictionary of English

  • n. A cluster, crowd, or throng; an assemblage, either of persons or things, collected without any regular form or arrangement.
  • n. An assemblage of objects in a certain order or relation, or having some resemblance or common characteristic.
  • n. A variously limited assemblage of animals or plants, having some resemblance, or common characteristics in form or structure. The term has different uses, and may be made to include certain species of a genus, or a whole genus, or certain genera, or even several orders.
  • n. A number of eighth, sixteenth, etc., notes joined at the stems; -- sometimes rather indefinitely applied to any ornament made up of a few short notes.
  • transitive v. To form a group of; to arrange or combine in a group or in groups, often with reference to mutual relation and the best effect; to form an assemblage of.

from The Century Dictionary and Cyclopedia

  • To form into a group or into groups; arrange in a group or in groups; separate into groups: commonly with reference to the special mutual relation of the things grouped, to classification, or to some special design or purpose, as artistic effect.
  • To fall into combination or arrangement; form a group or part of a group: used chiefly with reference to artistic effect.
  • See groop.
  • n. An assemblage of persons or things; a number of persons or things gathered together with or without regular interconnection or arrangement; a cluster.
  • n. In the fine arts, an assemblage of figures which have some relation to one another and to the general design; a combination of several figures forming a harmonious whole.
  • n. In scientific classifications, a number of individual things or persons related in some definite or classificatory way.
  • n. Specifically— In zoology, any assemblage or classificatory division of animals below the kingdom and above the species: generally said of intermediate or not regularly recognized divisions, or by way of non-committal to the exact taxonomic value of the division thus indicated.
  • n. In geology, a division in the geological sequence or classification of the stratified fossiliferous rocks inferior in value to a system or series. See system.
  • n. In music: A short rapid figure or division, especially when sung to a single syllable.
  • n. A section of an orchestra, comprising the instruments of the same class: as, the wood-wind group.
  • n. In mathematics, a set of substitutions (or other operations) such that every product of operations of the set itself belongs to the set; a system of conjugate substitutions; a set of permutations resulting from performing all the substitutions of a conjugate system upon a series of elements; a set of functions produced by the n operations of a group of operations from n independent functions, called the fundamental system of the group.
  • n. A group of infinitely many but discrete operations, among which infinitely small transformations occur.
  • n. in mathematics, a group whose elements have each k indices, or are arranged in a matrix of k dimensions.
  • n. In Capelli's extended sense, groups which can be separated each into the same number of subgroups, so that a substitution of a subgroup in the one can be so coordinated to one of the other that products shall correspond to products.
  • n. In the recommendations of the International Geological Congress this term is applied, in geological classification, to stratigraphic divisions of the highest order comprising several terrains. Its equivalent term in the time scale is era.
  • n. In combinatorial analysis, one of the classes into which the objects are distributed when the order of the objects in a particular class is material.
  • n. In group-theory, a set of definite operations containing the operation compounded of any two of the set, and also the inverse of every operation of the set.
  • n. In crystallography, a class of crystals characterized by the same degree of symmetry. Each crystalline system embraces several such groups or classes. See symmetry, where the names commonly employed in designating the more important of these groups are given.
  • n. In ethnology, a number of people united together by common habits and usages.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
  • n. any number of entities (members) considered as a unit
  • v. arrange into a group or groups
  • n. a set that is closed, associative, has an identity element and every element has an inverse
  • v. form a group or group together


from The American Heritage® Dictionary of the English Language, 4th Edition

French groupe, from Italian gruppo, probably of Germanic origin.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From French groupe ("cluster, group"), from Italian gruppo, groppo ("a knot, heap, group, bag (of money)"), from Proto-Germanic *kruppaz (“lump, round mass, body, crop”), from Proto-Indo-European *greub- (“to crumple, bend, crawl”). Cognate with German Kropf ("crop, craw, bunch"), Old English cropp, croppa ("cluster, bunch, sprout, flower, berry, ear of corn, crop"), Dutch krop ("craw"), Old Norse kroppr ("hump, bunch"). More at crop, croup.


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