mag·ni·fi·ca·tion / ˌmagnəfiˈkāshən/ • n. the action or process of magnifying something or being magnified, esp. visually: visible under high magnification. ∎  the degree to which something is or can be magnified: at this magnification the pixels making up the image become visible. ∎  the magnifying power of an instrument: this microscope should give a magnification of about 100. ∎  a magnified reproduction of something.

magnification Measure of the enlarging power of a microscope or telescope. It is the size of an object's image produced by the instrument compared with the size of the object viewed with the unaided eye.