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masquerade
Mass
Mass.
mass
mass balance
mass communication
mass defect
mass-energy equation
mass-energy equivalence
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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
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