(1)   Any number of entities (members) considered as a unit
(2)   A set that is closed, associative, has an identity element and every element has an inverse
(3)   (chemistry) two or more atoms bound together as a single unit and forming part of a molecule


(4)   Arrange into a group or groups
"Can you group these shapes together?"
(5)   Form a group or group together


From groupe "cluster, group" from gruppo "knot, group", of origin, from . Akin to cropp "craw, top, bunch", krop "craw", Kropf "crop, craw, bunch", kroppr "hump, bunch"


  1. A number of things or persons being in some relation to one another.
    There is a group of houses behind the hill.
    A group of people gathered in front of the Parliament to demonstrate against the Prime Minister's proposals.
    He left town to join a Communist group
  2. A set with an associative binary operation, under which there exists an identity element, and such that each element has an inverse.
  3. A (usually small) group of people who perform music together.
    Did you see the new jazz group?
  4. A small number (up to about fifty) of galaxies that are near each other.
  5. A column in the periodic table of chemical elements.
  6. A functional entity consisting of certain atoms whose presence provides a certain property to a molecule, such as the methyl group.
  7. A subset of a culture or of a society.
  8. An air force formation.
  9. A collection of formations or rock strata.
  10. In the Unix operating system, a number of users with same rights with respect to accession, modification, and execution of files, computers and peripherals.
  11. An element of an espresso machine from which hot water pours into the portafilter.


  • (number of things or persons being in some relation to each other): collection, set
  • (people who perform music together): band, ensemble
  • See also Wikisaurus:group


  • (put together to form a group): amass, categorise/categorize, classify, collect, collect up, gather, gather together, gather up