(category theory) For a given category C, its dual category Cᵒᵖ is obtained by reversing the direction of each one of the arrows of C.

(mathematics) The limit of two (or more) objects, considered without regard to any arrows between them.

(idiomatic, said of an ornament or an object) To be rarely used.

plural of catalytic converter

(military, slang) An instance of damaging a vehicle by weaponry that renders it both unusable and unrepairable.

Alternative spelling of bycatch

present participle of catch some zs

plural of catch-up; alternative spelling of catch ups

plural of catch up

(informal) Someone who catches up