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1. (n.) radioactivity
the phenomenon, a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element.
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| Definition of 'radioactivity' |
Princeton's WordNet |
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1. (noun) radiation, radioactivity
the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
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| Definition of 'radioactivity' |
U.S. National Library of Medicine |
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1. radioactivity
The spontaneous transformation of a nuclide into one or more different nuclides, accompanied by either the emission of particles from the nucleus, nuclear capture or ejection of orbital electrons, or fission. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
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Definitions of radioactivity 
