1. group, grouping (noun)
any number of entities (members) considered as a unit.
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 noun
a group of plants or animals.
(plural) any group of human beings (men or women or children) collectively.
social group noun
people sharing some social relation.
all of the identical copies of something offered to the public at the same time.
electron shell noun
a grouping of electrons surrounding the nucleus of an atom.
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.
a distinct and often subordinate group within a group.
a group of organisms of the same species inhabiting a given area.
(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.
a group of postage stamps having a common theme or a group of coins or currency selected as a group for study or collection.
any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions.
2. group (verb)
arrange into a group or groups.
3. chemical group, radical, group (noun)
(chemistry) two or more atoms bound together as a single unit and forming part of a molecule.
a hydrocarbon radical that occurs in many organic compounds.
carbonyl group noun
the bivalent radical CO.
the chemical group that gives color to a molecule.
a trivalent radical derived from glycerol by removing the three hydroxyl radicals.
ketone group noun
a group having the characteristic properties of ketones.
a hydrocarbon radical (C4H9).
nitro group noun
the group -NO3.
the radical -NO2 or any compound containing it (such as a salt or ester of nitrous acid).
4. aggroup, group (verb)
form a group or group together.
5. mathematical group, group (noun)
a set that is closed, associative, has an identity element and every element has an inverse.
(mathematics) an abstract collection of numbers or symbols.
group A (noun)
the blood group whose red cells carry the A antigen
group AB (noun)
the blood group whose red cells carry both the A and B antigens
group action (noun)
action taken by a group of people
group Amentiferae (noun)
used in some classification systems for plants that bear catkins
group B (noun)
the blood group whose red cells carry the B antigen
group captain (noun)
a commissioned officer (especially one in the Royal Air Force) equivalent in rank to a colonel in the army
group Centrospermae (noun)
used in former classification systems; approximately synonymous with order Caryophyllales
group discussion (noun)
a discussion among participants who have an agreed (serious) topic
group dynamics (noun)
the branch of social psychology that studies the psychodynamics of interaction in social groups
group insurance (noun)
insurance that is purchased by a group (such as the employees of a company) usually at a reduced rate to individual members of the group
group meeting (noun)
a formally arranged gathering
group O (noun)
the blood group whose red cells carry neither the A nor B antigens
group participation (noun)
participation by all members of a group
group practice (noun)
(medicine) the practice of medicine by a group of physicians who share their premises and other resources
group psychotherapy (noun)
psychotherapy in which a small group of individuals meet with a therapist; interactions among the members are considered to be therapeutic