Definition of energy

• n. - Internal or inherent power; capacity of acting, operating, or producing an effect, whether exerted or not; as, men possessing energies may suffer them to lie inactive.
• n. - Power efficiently and forcibly exerted; vigorous or effectual operation; as, the energy of a magistrate.
• n. - Strength of expression; force of utterance; power to impress the mind and arouse the feelings; life; spirit; -- said of speech, language, words, style; as, a style full of energy.
• n. - Capacity for performing work.