An unintended consequence of any action in addition to the intended consequence of that action.

The apparent change in frequency or wavelength of a wave that is perceived by an observer moving relative to the source of the waves.

(physics) an effect that arises from the relation between the angular momentum and the magnetization of a magnetic substance

(physics) the effect in which a conductor that carries an electric current perpendicular to an applied magnetic field develops a voltage gradient transverse to both current and field

(film, television) An effect that cannot be reasonably achieved by normal means, as for example by the digital manipulation of previously filmed footage.

(physics) The zero-voltage current of paired electrons through a weak connection between superconductors.

(physics) Birefringence of a material induced by an electric field due to partial orientation of its molecules.

(of a drug, etc.) To become active; to become effective. / (of a law, etc.) To come into force, to come into effect, to inure.

(physics) the reversible change in temperature that accompanies the change of magnetization of a ferromagnetic or paramagnetic material

(physics) The total expulsion of magnetic flux from the interior of a superconducting metal when it is cooled in a magnetic field below a critical temperature, near absolute zero, at which the transition to superconductivity takes place.