n (uncountable) The division of society into classes.
n (uncountable) Admirable behavior; elegance.
n (countable|and|uncountable) A group of students in a regularly scheduled meeting with a teacher.
n A series of classes covering a single subject.
n (countable) A group of students who commenced or completed their education during a particular year. A school class.
n (countable) A category of seats in an airplane, train or other means of mass transportation.
n (biology|taxonomy|countable) A rank in the classification of organisms, below phylum and above order; a taxon of that rank.
n Best of its kind.
n (mathematics) A collection of sets definable by a shared property.
n (military) A group of people subject to be conscripted in the same military draft, or more narrowly those persons actually conscripted in a particular draft.
n (programming|object-oriented) A set of objects having the same behavior (but typically differing in state), or a template defining such a set.