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mass-energy equivalence
mass-en·er·gy e·quiv·a·lence


noun 
Definition:
 
theory that mass equals energy: the principle in the theory of relativity that mass and energy are equivalent and interchangeable according to the equation E = mc2
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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