noun

• A group, collection, category or set sharing characteristics or attributes.
• A social grouping, based on job, wealth, etc. In Britain, society is commonly split into three main classes; upper class, middle class and working class.
• The division of society into classes.
• Admirable behavior; elegance.
• A group of students in a regularly scheduled meeting with a teacher.
• A series of lessons covering a single subject.
• A group of students who commenced or completed their education during a particular year. A school class.
• A category of seats in an airplane, train or other means of mass transportation.
• A rank in the classification of organisms, below phylum and above order; a taxon of that rank.
• Best of its kind.
• A grouping of data values in an interval, often used for computation of a frequency distribution.
• A collection of sets definable by a shared property.
• A group of people subject to be conscripted in the same military draft, or more narrowly those persons actually conscripted in a particular draft.
• A set of objects having the same behavior (but typically differing in state), or a template defining such a set.
• One of the sections into which a Methodist church or congregation is divided, supervised by a class leader.