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
• (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