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