from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A wave of energy having a frequency within the electromagnetic spectrum and propagated as a periodic disturbance of the electromagnetic field when an electric charge oscillates or accelerates.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. electromagnetic radiation, such as light and radio waves
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge
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