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masquer
masquerade
Mass
Mass.
mass
mass balance
mass communication
mass defect
mass-energy equation
mass-energy equivalence
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mass-energy equation
mass-en·er·gy e·qua·tion


noun 
Definition:
 
equation relating energy and mass: the mathematical relationship derived from special relativity E = mc2, in which E is energy, m is mass, and c is the speed of light
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