Definition of electromagnetism
1 : magnetism developed by a current of electricity
2a : a fundamental physical force that is responsible for interactions between charged particles which occur because of their charge and for the emission and absorption of photons, that is about a hundredth the strength of the strong force, and that extends over infinite distances but is dominant over atomic and molecular distances
— called also electromagnetic force— compare gravity sense 3a(2), strong force, weak force
b : a branch of physical science that deals with the physical relations between electricity and magnetism
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