1. Noun.  A number of things or persons being in some relation to one another.
  2. Noun.  (group theory) A set with an associative binary operation, under which there exists an identity element, and such that each element has an inverse.
  3. Noun.  A (usually small) group of people who perform music together.
  4. Noun.  (astronomy) A small number (up to about fifty) of galaxies that are near each other.
  5. Noun.  (chemistry) A column in the periodic table of chemical elements.
  6. Noun.  (chemistry) A functional entity consisting of certain atoms whose presence provides a certain property to a molecule, such as the methyl group.
  7. Noun.  (sociology) A subset of a culture or of a society.
  8. Noun.  (military) An air force formation.
  9. Noun.  (geology) A collection of formations or rock strata.
  10. Noun.  (computing) 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. Noun.  An element of an espresso machine from which hot water pours into the portafilter.
  12. Verb.  (transitive) To put together to form a group.
  13. Verb.  (intransitive) To come together to form a group.

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This entry was last updated on RefTopia from its source on 3/20/2012.