Pronunciation: (em"u-nā'shun), [key]
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.