1.  group(n = noun.tops) grouping - any number of entities (members) considered as a unit;
is a kind of abstract entity, abstraction
has particulars: human beings, human race, humanity, humankind, humans, man, mankind, world, arrangement, straggle, kingdom, biological group, biotic community, community, people, social group, accumulation, aggregation, assemblage, collection, edition, electron shell, ethnic group, ethnos, race, association, cloud, swarm, subgroup, sainthood, citizenry, people, population, hoi polloi, mass, masses, multitude, people, the great unwashed, varna, circuit, scheme, system, series, actinide, actinoid, actinon, lanthanide, lanthanoid, lanthanon, rare-earth element, rare earth, halogen, great lakes
Derived forms verb group₁, verb group₂

2.  group(n = noun.substance) chemical group, radical - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule;
is a kind of building block, unit
is a part of molecule
has particulars: acyl, acyl group, alcohol group, alcohol radical, aldehyde group, aldehyde radical, alkyl, alkyl group, alkyl radical, allyl, allyl group, allyl radical, amino, amino group, amyl, azido group, azido radical, azo group, azo radical, benzyl, benzyl group, benzyl radical, benzoyl group, benzoyl radical, arsenic group, cacodyl, cacodyl group, cacodyl radical, carbonyl group, carboxyl, carboxyl group, chromophore, cyanide group, cyanide radical, cyano group, cyano radical, glyceryl, hydrazo group, hydrazo radical, hydroxyl, hydroxyl group, hydroxyl radical, ketone group, methylene, methylene group, methylene radical, propyl, propyl group, propyl radical, butyl, nitro group, nitrite, uranyl, uranyl group, uranyl radical, vinyl, vinyl group, vinyl radical

3.  group(n = noun.cognition) mathematical group - a set that is closed, associative, has an identity element and every element has an inverse;
is a kind of set
has particulars: subgroup, abelian group, commutative group

1.  group(v = verb.cognition) - arrange into a group or groups; "Can you group these shapes together?"
is one way to assort, class, classify, separate, sort, sort out
Derived forms noun group₁, noun grouping₂
Sample sentences: Somebody ----s something; Somebody ----s somebody

2.  group(v = verb.competition) aggroup - form a group or group together;
is one way to assemble, foregather, forgather, gather, meet
Derived forms noun group₁, noun grouping₂
Sample sentences: The crowds group in the streets

1.  A cluster, crowd, or throng; an assemblage, either of persons or things, collected without any regular form or arrangement; as, a group of men or of trees; a group of isles. [1913 Webster]

2.  An assemblage of objects in a certain order or relation, or having some resemblance or common characteristic; as, groups of strata. [1913 Webster]

3.  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. [1913 Webster]

4.  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. [1913 Webster]

   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. [1913 Webster]
"The difficulty lies in drawing and disposing, or, as the painters term it, in grouping such a multitude of different objects." [1913 Webster]

group, n. & v.
--n.
1 a number of persons or things located close together, or considered or classed together.
2 (attrib.) concerning or done by a group (a group photograph; group sex).
3 a number of people working together or sharing beliefs, e.g. part of a political party.
4 a number of commercial companies under common ownership.
5 an ensemble playing popular music.
6 a division of an air force or air-fleet.
7 Math. a set of elements, together with an associative binary operation, which contains an inverse for each element and an identity element.
8 Chem. a a set of ions or radicals giving a characteristic qualitative reaction. b a set of elements having similar properties. c a combination of atoms having a recognizable identity in a number of compounds.
--v.
1 tr. & intr. form or be formed into a group.
2 tr. (often foll. by with) place in a group or groups.
3 tr. form (colours, figures, etc.) into a well-arranged and harmonious whole.
4 tr. classify.

Idiom:
group captain an RAF officer next below air commodore. group dynamics Psychol. the field of social psychology concerned with the nature, development, and interactions of human groups. group practice a medical practice in which several doctors are associated. group therapy therapy in which patients with a similar condition are brought together to assist one another psychologically. group velocity the speed of travel of the energy of a wave or wave-group.

Derivative:
groupage n.

Etymology:
F groupe f. It. gruppo f. Gmc, rel. to CROP

VB  reduce to order, bring into order, introduce order into, rally, arrange, dispose, place, form, put in order, set in order, place in order, set out, collocate, pack, marshal, range, size, rank, group, parcel out, allot, distribute, deal, cast the parts, assign the parts, dispose of, assign places to, assort, sort, sift, riddle, put to rights, set to rights, put into shape, put in trim, put in array, apportion, class, classify, divide, file, string together, thread, register, catalogue, tabulate, index, graduate, digest, grade, methodize, regulate, systematize, coordinate, organize, settle, fix, unravel, disentangle, ravel, card, disembroil, feaze.

N  assemblage, collection, collocation, colligation, compilation, levy, gathering, ingathering, muster, attroupement, team, concourse, conflux, congregation, contesseration, convergence, meeting, levee, reunion, drawing room, at home, conversazione, assembly, congress, convention, conventicle, gemote, conclave, posse, posse comitatus, Noah's ark, miscellany, collectanea, museum, menagerie, museology, crowd, throng, group, flood, rush, deluge, rabble, mob, press, crush, cohue, horde, body, tribe, crew, gang, knot, squad, band, party, swarm, shoal, school, covey, flock, herd, drove, atajo, bunch, drive, force, mulada, remuda, roundup, array, bevy, galaxy, corps, company, troop, troupe, task force, army, regiment, host, populousness, clan, brotherhood, fraternity, sorority, association, volley, shower, storm, cloud, group, cluster, Pleiades, clump, pencil, set, batch, lot, pack, budget, assortment, bunch, parcel, packet, package, bundle, fascine, fasces, bale, seron, seroon, fagot, wisp, truss, tuft, shock, rick, fardel, stack, sheaf, haycock, fascicle, fascicule, fasciculus, gavel, hattock, stook, accumulation, congeries, heap, lump, pile, rouleau, tissue, mass, pyramid, bing, drift, snowball, snowdrift, acervation, cumulation, glomeration, agglomeration, conglobation, conglomeration, conglomerate, coacervate, coacervation, coagmentation, aggregation, concentration, congestion, omnium gaterum, spicilegium, black hole of Calcutta, quantity, collector, gatherer, whip, whipper in, assembled, closely packed, dense, serried, crowded to suffocation, teeming, swarming, populous, as thick as hops, all of a heap, fasciculated cumulative, the plot thickens, acervatim, tibi seris tibi metis, assemblage, collection, collocation, colligation, compilation, levy, gathering, ingathering, muster, attroupement, team, concourse, conflux, congregation, contesseration, convergence, meeting, levee, reunion, drawing room, at home, conversazione, assembly, congress, convention, conventicle, gemote, conclave, posse, posse comitatus, Noah's ark, miscellany, collectanea, museum, menagerie, museology, crowd, throng, group, flood, rush, deluge, rabble, mob, press, crush, cohue, horde, body, tribe, crew, gang, knot, squad, band, party, swarm, shoal, school, covey, flock, herd, drove, atajo, bunch, drive, force, mulada, remuda, roundup, array, bevy, galaxy, corps, company, troop, troupe, task force, army, regiment, host, populousness, clan, brotherhood, fraternity, sorority, association, volley, shower, storm, cloud, group, cluster, Pleiades, clump, pencil, set, batch, lot, pack, budget, assortment, bunch, parcel, packet, package, bundle, fascine, fasces, bale, seron, seroon, fagot, wisp, truss, tuft, shock, rick, fardel, stack, sheaf, haycock, fascicle, fascicule, fasciculus, gavel, hattock, stook, accumulation, congeries, heap, lump, pile, rouleau, tissue, mass, pyramid, bing, drift, snowball, snowdrift, acervation, cumulation, glomeration, agglomeration, conglobation, conglomeration, conglomerate, coacervate, coacervation, coagmentation, aggregation, concentration, congestion, omnium gaterum, spicilegium, black hole of Calcutta, quantity, collector, gatherer, whip, whipper in, assembled, closely packed, dense, serried, crowded to suffocation, teeming, swarming, populous, as thick as hops, all of a heap, fasciculated cumulative, the plot thickens, acervatim, tibi seris tibi metis.

VB  assemble, collect, muster, meet, unite, join, rejoin, cluster, flock, swarm, surge, stream, herd, crowd, throng, associate, congregate, conglomerate, concentrate, precipitate, center round, rendezvous, resort, come together, flock get together, pig together, forgather, huddle, reassemble, assemble, muster, bring together, get together, put together, draw together, scrape together, lump together, collect, collocate, colligate, get, whip in, gather, hold a meeting, convene, convoke, convocate, rake up, dredge, heap, mass, pile, pack, put up, truss, cram, acervate, agglomerate, aggregate, compile, group, aggroup, concentrate, unite, collect into a focus, bring into a focus, amass, accumulate, collect in a dragnet, heap Ossa upon Pelion.

N  party, faction, side, denomination, communion, set, crew, band, horde, posse, phalanx, family, clan, team, tong, council, community, body, fellowship, sodality, solidarity, confraternity, familistere, familistery, brotherhood, sisterhood, knot, gang, clique, ring, circle, group, crowd, in-crowd, coterie, club, casino, machine, Tammany, Tammany Hall, corporation, corporate body, guild, establishment, company, copartnership, partnership, firm, house, joint concern, joint-stock company, cahoot, combine, trust, society, association, institute, institution, union, trades union, league, syndicate, alliance, Verein, Bund, Zollverein, combination, Turnverein, league offensive and defensive, alliance offensive and defensive, coalition, federation, confederation, confederacy, junto, cabal, camarilla, camorra, brigue, freemasonry, party spirit, Confederates, Conservatives, Democrats, Federalists, Federals, Freemason, Knight Templar, Kuklux, Kuklux Klan, KKK, Liberals, Luddites, Republicans, Socialists, Tories, Whigs staff, dramatis personae, in league, in partnership, in alliance, bonded together, banded together, linked, joined together, embattled, confederated, federative, joint, hand in hand, side by side, shoulder to shoulder, en masse, in the same boat.

abelian group, abo blood group system, abo group, acetyl group, acyl group, adapid group, age group, air group, alcohol group, aldehyde group, alkyl group, allyl group, amino group, amphibole group, animal group, armed islamic group, arsenic group, as a group, azido group, azo group, battle group, benzoyl group, benzyl group, biological group, blood group, bloomsbury group, cacodyl group, carbonyl group, carboxyl group, chemical group, colorado group, commutative group, congo group, core group, cyanide group, cyano group, elite group, encounter group, ethanoyl group, ethnic group, ethyl group, first of october antifascist resistance group, group a, group ab, group action, group amentiferae, group b, group captain, group centrospermae, group discussion, group dynamics, group insurance, group meeting, group o, group participation, group practice, group psychotherapy, group pteridospermae, group pteridospermaphyta, group theory, group therapy, harlech group, helium group, hydrazo group, hydroxyl group, in group, interest group, islamic group, islamic group of uzbekistan, jazz group, kaplan group, ketone group, kin group, kinship group, laramie group, libyan fighting group, libyan islamic fighting group, libyan islamic group, linkage group, llandeilo group, ludlow group, malaysia militant group, malaysian mujahidin group, mathematical group, methyl group, methylene group, military group, minority group, musical group, nitro group, occupational group, omomyid group, orange group, orly group, out group, peer group, phycomycetes group, play group, pop group, portage group, potsdam group, pressure group, propyl group, psychotherapy group, quebec group, rap group, revolutionary group, rock group, salafast group for call and combat, salafist group, scout group, skiffle group, social group, splinter group, t group, taxonomic group, terrorist group, united self-defense group of colombia, uranyl group, vinyl group, wenlock group, working group