1the strength and vitality required for sustained physical or mental activity:changes in the levels of vitamins can affect energy and well-being
(energies) a person’s physical and mental powers:an alternative is to devote your energies to voluntary work
2power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines:nuclear energy
3 Physics the property of matter and radiation which is manifest as a capacity to perform work (such as causing motion or the interaction of molecules):a collision in which no energy is transferred
