from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The energy equivalent of the rest mass of a body, equal to the rest mass multiplied by the speed of light squared.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The energy of the mass component of a body at rest; equal to the product its rest mass and the square of the speed of light
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the energy equivalent to the mass of a particle at rest in an inertial frame of reference; equal to the rest mass times the square of the speed of light
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