to identify by or divide into classes; to categorize / to declare something a secret, especially a government secret / To make classy

Sorted into classes or categories.

Able to be classified.

(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.

plural of subset classifier

plural of subobject classifier

(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.