# rest energy

- 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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## Origin of rest energy

First recorded in 1935–40

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## rest energy

[rĕst]

- 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.

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The American Heritage® Science Dictionary
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