The term induction is used in several fields, particularly in electricity, physics and biology.
Electromagnetic induction is the production of an electric current, of a voltage (electromotive force) in a circuit by the effect of the variation over time of the magnetic flux of a magnetic field through this circuit (rotation of a coil in a fixed field, variation in current etc.).
Self-induction consists in the appearance of a magnetic field within a winding under the effect of a variation in the strength of the current flowing through it.
A quantity noted B associated with the magnetic field, (for physicists, B is the magnetic field), the magnetic flux density. See magnetisation.
The mechanism by which embryonic tissue is formed under the effect of a signal from another tissue.
Induction is the production of an electric current at a distance. © Alfredo Louro, Flickr CC by nc-sa 30.