In the best of its category.

(agriculture) A commodity, usually produced on farms and part of a larger category. Products within a market class have similar physical characteristics, are grown or raised under similar conditions, and are bought and sold under similar terms and conditions.

(mathematics) An equivalence class of an equivalence relation that is a congruence.

(object-oriented programming) A nested inner class whose functions and member variables can be overridden and redefined by subclasses of an outer class. / (education) An online class.

(computational complexity theory) a set of computational problems of related resource-based complexity

Synonym of class action

plural of class suit

plural of class war

Synonym of class warfare

(military, historical) The Soviet Union's first class of nuclear-powered attack submarines, in service from 1958 through 1990.