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Definition of energy
noun (plural energies)
1the strength and vitality required for sustained physical or mental activity:changes in the levels of vitamins can affect energy and well-being
) a person’s physical and mental powers, typically as applied to a particular task or activity.
2power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines. 3 Physics the property of matter and radiation that 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 a degree or level of energy possessed by something or required by a process.