extension in Polish

That property of a body by which it occupies a portion of space (or time, e.g. "spatiotemporal extension").

(computing) An optional software component that adds functionality to an application.

(ring theory, of an ideal in the domain of a ring homomorphism) The ideal in the codomain generated by the image of the given ideal under the given homomorphism.

(ring theory, of an ideal in the domain of a ring homomorphism) The ideal in the codomain generated by the image of the given ideal under the given homomorphism.