from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A wave of electromagnetic energy that is radiated by an accelerating or oscillating electric charge and propagates through a vacuum or a material medium as a periodic disturbance of the electromagnetic field at a frequency within the electromagnetic spectrum.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics
electromagnetic radiation, such as lightand radiowaves
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge
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