Dictionary![]() ![]() em•a•na•tionPronunciation: (em"u-nā'shun), [key] —n. 1. an act or instance of emanating. 2. something that emanates or is emanated. 3. Physical Chem.a gaseous product of radioactive disintegration, including radon, thoron, and actinon. Symbol: Em Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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