Excitation

—1. The electrification of a substance. 2. The magnetization of a magnetizable substance. 3. The magnetizing of the field magnets of a dynamo or motor by the pa age of a current through the winding of the magnets. The exciting current is obtained either from the machine itself in self-exciting dynamos, or from an ' outside source in separately excited dynamos. 4. In electro-therapeutics, the stimulation of muscular or nerve ti ue in the human body.