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energyA measurable physical quantity, with dimensions mass times velocity squared, that is conserved for an isolated system. Energy of motion is kinetic energy; energy of position is potential energy. See energy conversion, internal energy, enthalpy.
Feynman, R. P., R. B. Leighton, and M. Sands, 1963: The Feynman Lectures in Physics, Vol. I, p. 4-2.