the phenomena associated with electric and magnetic fields and their interactions with each other and with electric charges and currents.
Also, electromagnetics. the science that deals with these phenomena.

1820–30; electro- + magnetism

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World English Dictionary
electromagnetism (ɪˌlɛktrəʊˈmæɡnɪˌtɪzəm)
1.  magnetism produced by an electric current
2.  Also called: electromagnetics the branch of physics concerned with magnetism produced by electric currents and with the interaction of electric and magnetic fields

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Word Origin & History

1828, from electro- (see electric) + magnetism.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
electromagnetism   (ĭ-lěk'trō-māg'nĭ-tĭz'əm)  Pronunciation Key 
Any of the wide range of phenomena associated with the behavior and interaction of electric charges and electric and magnetic fields, such as electricity, magnetism, chemical bonds, and all forms of electromagnetic radiation, including light.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Henry's fame rests on his pioneering work on the nature of electromagnetism.
Physicists make no attempt to explain why things obey the law of
  electromagnetism or of gravitation.
What is particularly interesting about it is that it does not notice
There was no distinction between electromagnetism and the weak interaction.
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