A group is an organization of people or things, like a reading group at a public library that holds book discussions every month.

Group comes from the word for lump, or cluster. If you're out walking at night and see a group of wild dogs coming at you, best to go the other way. You could always find a group of people to walk with if you don't want to be alone. Group can also be used as a verb. If you're painting a still life, you might collect a bunch of objects from your house and group them together in an eye-pleasing arrangement.

Definitions of group
  1. noun
    any number of entities (members) considered as a unit
    synonyms: grouping
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    Great Lakes
    a group of five large, interconnected lakes in central North America
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    human beings, human race, humanity, humankind, humans, man, mankind, world
    all of the living human inhabitants of the earth
    an orderly grouping (of things or persons) considered as a unit; the result of arranging
    a wandering or disorderly grouping (of things or persons)
    a basic group of natural objects
    biological group
    a group of plants or animals
    biotic community, community
    (ecology) a group of interdependent organisms inhabiting the same region and interacting with each other
    (plural) any group of human beings (men or women or children) collectively
    social group
    people sharing some social relation
    accumulation, aggregation, assemblage, collection
    several things grouped together or considered as a whole
    all of the identical copies of something offered to the public at the same time
    electron shell
    a grouping of electrons surrounding the nucleus of an atom
    ethnic group, ethnos
    people of the same race or nationality who share a distinctive culture
    people who are believed to belong to the same genetic stock
    (ecology) a group of organisms (plants and animals) that live together in a certain geographical region and constitute a community with a few dominant species
    cloud, swarm
    a group of many things in the air or on the ground
    a distinct and often subordinate group within a group
    saints collectively
    citizenry, people
    the body of citizens of a state or country
    a group of organisms of the same species inhabiting a given area
    hoi polloi, mass, masses, multitude, people, the great unwashed
    the common people generally
    (Hinduism) the name for the original social division of Vedic people into four groups (which are subdivided into thousands of jatis)
    (law) a judicial division of a state or the United States (so-called because originally judges traveled and held court in different locations); one of the twelve groups of states in the United States that is covered by a particular circuit court of appeals
    scheme, system
    a group of independent but interrelated elements comprising a unified whole
    a group of postage stamps having a common theme or a group of coins or currency selected as a group for study or collection
    actinide, actinoid, actinon
    any of a series of radioactive elements with atomic numbers 89 through 103
    lanthanide, lanthanoid, lanthanon, rare earth, rare-earth element
    any element of the lanthanide series (atomic numbers 57 through 71)
    any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
    the group of journalists and professionals involved in mass communications
    members of one gender considered as a group
    the group action of a collection of people or animals or vehicles moving ahead in more or less regular formation
    floral arrangement, flower arrangement
    a decorative arrangement of flowers
    contrivance, lash-up
    any improvised arrangement for temporary use
    a collection or stock of drugs
    a temporary arrangement erected around a building for convenience of workers
    a collection of objects threaded on a single strand
    collection of clothing belonging to one person
    collection of costumes belonging to a theatrical company
    population, universe
    (statistics) the entire aggregation of items from which samples can be drawn
    language system
    a system of linguistic units or elements used in a particular language
    an orderly arrangement
    categorisation, categorization, classification
    a group of people or things arranged by class or category
    mineral kingdom
    all inorganic objects; contrasts with animal and plant kingdoms
    a group of organisms sharing a specific genetic constitution
    a major biotic community characterized by the dominant forms of plant life and the prevailing climate
    the human beings of a particular nation or community or ethnic group
    age bracket, age group, cohort
    a group of people having approximately the same age
    people who lived in times long past (especially during the historical period before the fall of the Roman Empire in western Europe)
    people who are frustrated and perplexed
    people who have severe visual impairments, considered as a group
    people viewed as members of a group
    people who are brave
    cautious, timid
    people who are fearful and cautious
    business people, businesspeople
    people who transact business (especially business executives)
    country people, countryfolk
    people living in the same country; compatriots
    people who are condemned to eternal punishment
    people who are no longer living
    people who are still living
    people who have severe hearing impairments
    defeated, discomfited
    people who are defeated
    disabled, handicapped
    people collectively who are crippled or otherwise physically handicapped
    doomed, lost
    people who are destined to die soon
    any hostile group of people
    episcopacy, episcopate
    the collective body of bishops
    aestivation, estivation
    (botany) the arrangement of sepals and petals in a flower bud before it opens
    common people, folk, folks
    people in general (often used in the plural)
    free, free people
    people who are free
    people who are confined to their homes
    enlightened, initiate
    people who have been introduced to the mysteries of some field or activity
    people who have not been introduced to the mysteries of some field or activity
    developmentally challenged, mentally retarded, retarded
    people collectively who are mentally retarded
    network army
    a group of like-minded people united by the internet; a new kind of social or political of business group that may exert broad influence on a shared concern
    people having common origins or traditions and often comprising a nation
    peanut gallery
    (figurative) people whose criticisms are regarded as irrelevant or insignificant (resembling uneducated people who throw peanuts on the stage to express displeasure with a performance)
    a small isolated group of people
    people who have retreated
    people who are sick
    people engaged in trade
    maimed, wounded
    people who are wounded
    the collection of equipment and methods used in the practice of medicine
    art collection
    a collection of art works
    an accumulation of jobs not done or materials not processed that are yet to be dealt with (especially unfilled customer orders for products or services)
    a collection of related things intended for use together
    a number or quantity of related things dealt with as a unit
    book, rule book
    a collection of rules or prescribed standards on the basis of which decisions are made
    a collection of playing cards satisfying the rules of a card game
    bottle collection
    a collection of bottles
    bunch, caboodle, lot
    any collection in its entirety
    coin collection
    a collection of coins
    any collection of diverse things
    everything that is included in a collection and that is held or included in something
    ensemble, tout ensemble
    an assemblage of parts or details (as in a work of art) considered as forming a whole
    a collection of writings
    a collection of people or things appearing together
    tenants of an estate considered as a group
    a collection of tools and other articles used by an artisan to make jewelry or clothing or shoes
    flagstones collectively
    bits and splinters and fragments
    a complete collection of similar things
    deal, hand
    the cards held in a card game by a given player at any given time
    long suit
    in a hand, the suit having the most cards
    a collection of dried plants that are mounted and systematically classified for study
    stamp collection
    a collection of stamps
    statues collectively
    sum, sum total, summation
    the final aggregate
    a jumbled collection or mass
    a collection of gimmicks
    nuclear club
    the nations possessing nuclear weapons
    agglomerate, cumulation, cumulus, heap, mound, pile
    a collection of objects laid on top of each other
    an ill-structured collection of similar things (objects or people)
    a collection of things that have been combined; an assemblage of separate parts or qualities
    a group of persons associated by some common tie or occupation and regarded as an entity
    an extended social group having a distinctive cultural and economic organization
    a group of people migrating together (especially in some given time period)
    a group of people who differ racially or politically from a larger group of which it is a part
    a social group that forms part of the society or the economy
    ethnic minority
    a group that has different national or cultural traditions from the majority of the population
    color, colour, people of color, people of colour
    a race with skin pigmentation different from the white race (especially Blacks)
    Herrenvolk, master race
    a race that considers itself superior to all others and fitted to rule the others
    interest, interest group
    (usually plural) a social group whose members control some field of activity and who have common aims
    clan, kin, kin group, kindred, kinship group, tribe
    group of people related by blood or marriage
    your friends and acquaintances
    class, social class, socio-economic class, stratum
    people having the same social, economic, or educational status
    a social group holding marginal or extreme views
    assemblage, gathering
    a group of persons together in one place
    an assemblage of people or animals or things collected together
    hit parade
    a collection of the best or most popular people or items of a given kind
    historical and literary materials relating to Judaism
    a badly assembled collection of parts hastily assembled to serve some particular purpose (often used to refer to computing systems or software that has been badly put together)
    library, program library, subroutine library
    (computing) a collection of standard programs and subroutines that are stored and available for immediate use
    a collection of literary documents, records, or media kept for reference or borrowing
    myths collectively; the body of stories associated with a culture or institution or person
    an association between organisms that is harmful to one of them or between organisms and a metabolic product of another
    congregation, faithful, fold
    a group of people who adhere to a common faith and habitually attend a given church or place of worship
    a group of biological taxa or species that share features inherited from a common ancestor
    taxon, taxonomic category, taxonomic group
    animal or plant group having natural relations
    biology, biota
    all the plant and animal life of a particular region
    fauna, zoology
    all the animal life in a particular region or period
    petting zoo
    a collection of docile animals for children to pet and feed
    animal group
    a group of animals
    a group of organisms of the same type living or growing together
    infestation, plague
    a swarm of insects that attack plants
    a group of things of the same kind that belong together and are so used
    collection of materials of or characteristic of the Victorian era
    category, class, family
    a collection of things sharing a common attribute
    job lot
    a miscellaneous collection of things sold together
    bundle, package, packet, parcel
    a collection of things wrapped or boxed together
    organisation, organization
    a group of people who work together
    defence, defense, defense lawyers, defense team
    the defendant and his legal advisors collectively
    the lawyers acting for the state to put the case against the defendant
    a collection of plants (trees or shrubs or flowers) in a particular area
    signs collectively (especially commercial signs or posters)
    (linguistics) a large group of languages that are historically related
    GAAP, generally accepted accounting principles
    a collection of rules and procedures and conventions that define accepted accounting practice; includes broad guidelines as well as detailed procedures
    laity, temporalty
    in Christianity, members of a religious community that do not have the priestly responsibilities of ordained clergy
    all the gods of a religion
    Achaean, Arcado-Cyprians
    the ancient Greek inhabitants of Achaea
    the ancient Greek inhabitants of Aeolia
    the ancient Greek inhabitants of Doris who entered Greece from the north about 1100 BC
    the ancient Greek inhabitants of Attica and related regions in Ionia
    the body of enfranchised citizens; those qualified to vote
    the body of people who are citizens of a particular government
    judicatory, judicature, judicial system, judiciary
    the system of law courts that administer justice and constitute the judicial branch of government
    country, land, nation
    the people who live in a nation or country
    Free World
    anti-communist countries collectively
    Third World
    underdeveloped and developing countries of Asia and Africa and Latin America collectively
    the nations of the European continent collectively
    the nations of the Asian continent collectively
    North America
    the nations of the North American continent collectively
    Central America
    the nations of Central America collectively
    South America
    the nations of the South American continent collectively
    too much population
    poor, poor people
    people without possessions or wealth (considered as a group)
    rich, rich people
    people who have possessions and wealth (considered as a group)
    populace, public, world
    people in general considered as a whole
    the people who inhabit a territory or state
    a group of people having the power of effective action
    the reserve players on a team
    a group of persons who are engaged in a common activity
    (biology) a group of organisms forming a subdivision of a larger category
    the part of the general public interested in a source of information or entertainment
    followers, following
    a group of followers or enthusiasts
    revolving door
    an organization or institution with a high rate of turnover of personnel or membership
    band, circle, lot, set
    an unofficial association of people or groups
    gangdom, gangland, organized crime
    underworld organizations
    Oort cloud
    (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun
    a splendid assemblage (especially of famous people)
    extragalactic nebula, galaxy
    (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust
    a social group within a national culture that has distinctive patterns of behavior and beliefs
    a group of warships organized as a tactical unit
    group of motor vehicles operating together under the same ownership
    group of aircraft operating together under the same ownership
    nonalignment, nonalinement
    people (or countries) who are not aligned with other people (or countries) in a pact or treaty
    brahman, brahmin
    the highest of the four varnas: the priestly or sacerdotal category
    the second highest of the four varnas: the noble or warrior category
    the third of the four varnas: the commoners or yeoman farmers or mercantile and professional category
    shudra, sudra
    the lowest of the four varnas: the servants and workers of low status
    repertoire, repertory
    a collection of works (plays, songs, operas, ballets) that an artist or company can perform and do perform for short intervals on a regular schedule
    repertoire, repertory
    the entire range of skills or aptitudes or devices used in a particular field or occupation
    economic system, economy
    the system of production and distribution and consumption
    form of government, political system
    the members of a social organization who are in power
    a system formed by the interaction of a community of organisms with their physical environment
    group of genetically related organisms constituting a single step in the line of descent
    descendants, posterity
    all of the offspring of a given progenitor
    coevals, contemporaries, generation
    all the people living at the same time or of approximately the same age
    one of two basic subdivisions of a tribe
    folk, tribe
    a social division of (usually preliterate) people
    tableau, tableau vivant
    a group of people attractively arranged (as if in a painting)
    (botany) the arrangement of veins in a leaf
    (botany) the arrangement of young leaves in a leaf bud before it opens
    the people who support some common cause or business or principle or sectional interest
    social organisation, social organization, social structure, social system, structure
    the people in a society considered as a system organized by a characteristic pattern of relationships
    assortment, medley, miscellanea, miscellany, mixed bag, mixture, motley, potpourri, salmagundi, smorgasbord, variety
    a collection containing a variety of sorts of things
    batch, clutch
    a collection of things or persons to be handled together
    all the loaves of bread baked at the same time
    business, clientele, patronage
    customers collectively
    rank and file
    people who constitute the main body of any group
    smart money
    people who are highly experienced or who have inside information
    rogue's gallery
    a collection of pictures of criminals
    exhibition, expo, exposition
    a collection of things (goods or works of art etc.) for public display
    a collection of merchant ships with an escort of warships
    the aggregation of things (pedestrians or vehicles) coming and going in a particular locality during a specified period of time
    an arrangement of people or things acting as a unit
    air power, aviation
    the aggregation of a country's military aircraft
    a system of coordinated measures for apprehending (criminals or other individuals)
    a system of means and activities whereby a social institution functions
    network, web
    an interconnected system of things or people
    nonlinear system
    a system whose performance cannot be described by equations of the first degree
    a system that is part of some larger system
    a system considered analogous in structure or function to a living body
    a systematic orderly arrangement
    a collection of particulars considered as a system
    an entire system; used in the phrase `the whole shebang'
    botany, flora, vegetation
    all the plant life in a particular region or period
    jurisprudence, law
    the collection of rules imposed by authority
    a collection of live animals for study or display
    order, ordering, ordination
    logical or comprehensible arrangement of separate elements
    data, information
    a collection of facts from which conclusions may be drawn
    a collection of anecdotes about a person or place
    mail, post
    any particular collection of letters or packages that is delivered
    a collection of precious things
    treasure trove
    any collection of valuables that is discovered
    trinkets and other ornaments of dress collectively
    troponomy, troponymy
    the place names of a region or a language considered collectively
    front, movement, social movement
    a group of people with a common ideology who try together to achieve certain general goals
    people who have not confessed
    unemployed, unemployed people
    people who are involuntarily out of work (considered as a group)
    women as distinguished from men
    Jews collectively
    a collection of small fragments considered as a whole
    chosen people
    any people believing themselves to be chosen by God
    an ethnic group living in Azerbaijan
    an ethnic group speaking Bengali and living in Bangladesh and eastern India
    an ethnic group speaking Flemish and living in northern and western Belgium
    Hebrews, Israelites
    the ethnic group claiming descent from Abraham and Isaac (especially from Isaac's son Jacob); the nation whom God chose to receive his revelation and with whom God chose to make a covenant (Exodus 19)
    Mbundu, Ovimbundu
    an ethnic group speaking Umbundu and living in western Angola
    Tadzhik, Tajik
    an ethnic group (mostly Moslem) living in Tajikistan and neighboring areas of Uzbekistan and Afghanistan and China
    an ethnic group speaking a dialect of French and living in southern and eastern Belgium and neighboring parts of France
    a group within a political party or legislature or other organization that holds distinct views or has a particular function
    solar system
    the sun with the celestial bodies that revolve around it in its gravitational field
    water system
    a river and all of its tributaries
    Black race, Negro race, Negroid race
    a dark-skinned race
    Caucasian race, Caucasoid race, White people, White race
    a light-skinned race
    Mongolian race, Mongoloid race, Yellow race
    an Asian race
    Amerindian race, Indian race
    usually included in the Mongoloid race
    Indian race
    sometimes included in the Caucasian race; native to the subcontinent of India
    Abo, Aboriginal, Aborigine, Australian Aborigine, native Australian
    a dark-skinned member of a race of people living in Australia when Europeans arrived
    Slavic people, Slavic race
    a race of people speaking a Slavonic language
    a member of a people who live in Kurdistan, a region in southwest Asia; the largest ethnic group without their own state
    a member of the largest ethnic group in southeastern Nigeria
    a native or inhabitant of Nubia
    root system, rootage
    a developed system of roots
    terbium metal
    a separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium
    At, astatine, atomic number 85
    a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
    Br, atomic number 35, bromine
    a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
    Cl, atomic number 17, chlorine
    a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water)
    F, atomic number 9, fluorine
    a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite
    I, atomic number 53, iodin, iodine
    a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)
    a system or organized structure that is large, uniform, and powerful
    systems of mass communications (including publishing, broadcast news, and the internet) considered collectively
    people who are members of the same social or cultural group
    type of:
    abstract entity, abstraction
    a general concept formed by extracting common features from specific examples
  2. noun
    (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
    synonyms: chemical group, radical
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    acyl, acyl group
    any group or radical of the form RCO- where R is an organic group
    alcohol group, alcohol radical
    the chemical group -OH
    aldehyde group, aldehyde radical
    the chemical group -CHO
    alkyl, alkyl group, alkyl radical
    any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons
    allyl, allyl group, allyl radical
    the univalent unsaturated organic radical C3H5; derived from propylene
    amino, amino group
    the radical -NH2
    a hydrocarbon radical that occurs in many organic compounds
    azido group, azido radical
    the univalent group N3- derived from hydrazoic acid
    azo group, azo radical
    the bivalent group -N=N- united to two hydrocarbon groups
    benzyl, benzyl group, benzyl radical
    the univalent radical derived from toluene
    benzoyl group, benzoyl radical
    the univalent radical derived from benzoic acid
    arsenic group, cacodyl, cacodyl group, cacodyl radical
    the univalent group derived from arsine
    carbonyl group
    the bivalent radical CO
    carboxyl, carboxyl group
    the univalent radical -COOH; present in and characteristic of organic acids
    the chemical group that gives color to a molecule
    cyanide group, cyanide radical, cyano group, cyano radical
    the monovalent group -CN in a chemical compound
    a trivalent radical derived from glycerol by removing the three hydroxyl radicals
    hydrazo group, hydrazo radical
    the bivalent group -HNNH- derived from hydrazine
    hydroxyl, hydroxyl group, hydroxyl radical
    the monovalent group -OH in such compounds as bases and some acids and alcohols
    ketone group
    a group having the characteristic properties of ketones
    methylene, methylene group, methylene radical
    the bivalent radical CH2 derived from methane
    propyl, propyl group, propyl radical
    the monovalent organic group C3H7- obtained from propane
    a hydrocarbon radical (C4H9)
    nitro group
    the group -NO3
    the radical -NO2 or any compound containing it (such as a salt or ester of nitrous acid)
    uranyl, uranyl group, uranyl radical
    the bivalent radical UO2 which forms salts with acids
    vinyl, vinyl group, vinyl radical
    a univalent chemical radical derived from ethylene
    acetyl, acetyl group, acetyl radical, ethanoyl group, ethanoyl radical
    the organic group of acetic acid (CH3CO-)
    ethyl, ethyl group, ethyl radical
    the univalent hydrocarbon radical C2H5 derived from ethane by the removal of one hydrogen atom
    an amino derivative of glucose that is a component of many polysaccharides
    (chemistry) the negative univalent acyl radical CHO that occurs in aldehydes
    methyl, methyl group, methyl radical
    the univalent radical CH3- derived from methane
    sodium nitrite
    nitrite used to preserve and color food especially in meat and fish products; implicated in the formation of suspected carcinogens
    type of:
    building block, unit
    a single undivided natural thing occurring in the composition of something else
  3. noun
    a set that is closed, associative, has an identity element and every element has an inverse
    synonyms: mathematical group
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    (mathematics) a subset (that is not empty) of a mathematical group
    Abelian group, commutative group
    a group that satisfies the commutative law
    type of:
    (mathematics) an abstract collection of numbers or symbols
  4. verb
    arrange into a group or groups
    “Can you group these shapes together?”
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    reorganize into new groups
    classify or group
    chunk, collocate, lump
    group or chunk together in a certain order or place side by side
    batch together; assemble or process as a batch
    type of:
    assort, class, classify, separate, sort, sort out
    arrange or order by classes or categories
  5. verb
    form a group or group together
    synonyms: aggroup
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    team, team up
    form a team
    attach to, as a journalist to a military unit when reporting on a war
    gang, gang up
    act as an organized group
    join or form a pool of people
    form or unite into a brigade
    type of:
    assemble, foregather, forgather, gather, meet
    collect in one place
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