from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Energy transferred by radiation, especially by an electromagnetic wave.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Energy in a form that can
radiate, generally electromagnetic energy.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun energy that is transmitted in the form of (electromagnetic) radiation; energy that exists in the absence of matter
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