n A number of things or persons being in some relation to one another.
n (group theory) A set with an associative binary operation, under which there exists an identity element, and such that each element has an inverse.
n (geometry, archaic) An effective divisor on a curve.
n A (usually small) group of people who perform music together.
n (astronomy) A small number (up to about fifty) of galaxies that are near each other.
n (chemistry) A column in the periodic table of chemical elements.
n (chemistry) A functional group.
n (sociology) A subset of a culture or of a society.
n (military) An air force formation.
n (geology) A collection of formations or rock strata.
n (computing) A number of users with the same rights with respect to accession, modification, and execution of files, computers and peripherals.
n An element of an espresso machine from which hot water pours into the portafilter.
n (music) 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.
n (sports) A set of teams playing each other in the same division, while not during the same period playing any teams that belong to other sets in the division.
n (business) A commercial organization.
v (transitive) To put together to form a group.
v (intransitive) To come together to form a group.