Sorted into classes or categories.

plural of classifier

Able to be classified.

(mathematics) A topological space that is the quotient of a free action (of the specified group) on a weakly contractible space.

plural of classified advertisement

Any of a list of newspaper or website advertisements included with others under a heading describing the category of product or service offered.

plural of classifying space

(informal) classified advertisement

(mathematics) A set which serves as the codomain of a characteristic function. / (category theory, uncountable) The subobject classifier restricted to the category Set.

(category theory) An object which serves as the codomain of a classifying morphism, together with a "true" global element of the said object.