| 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. |
| rest energy n. The energy equivalent of the rest mass of a body, equal to the rest mass multiplied by the speed of light squared. |
rest energy  (rěst) Pronunciation Key
In Special Relativity, the energy corresponding to the rest mass of a body, equal to the rest mass multiplied by the speed of light squared. See more at mass-energy equivalence. |