\En"er*gy\, n.; pl. {Energies}. [F. ['e]nergie, LL.
energia, fr. Gr.?, fr. ? active; ? in + ? work. See {In}, and
{Work}.]
1. 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.
         The great energies of nature are known to us only by
         their effects.                        --Paley.
2. Power efficiently and forcibly exerted; vigorous or
   effectual operation; as, the energy of a magistrate.
3. 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.
4. (Physics) Capacity for performing work.
Note: The kinetic energy of a body is the energy it has in
      virtue of being in motion. It is measured by one half
      of the product of the mass of each element of the body
      multiplied by the square of the velocity of the
      element, relative to some given body or point. The
      available kinetic energy of a material system
      unconnected with any other system is that energy which
      is due to the motions of the parts of the system
      relative to its center of mass. The potential energy of
      a body or system is that energy which is not kinetic;
      -- energy due to configuration. Kinetic energy is
      sometimes called actual energy. Kinetic energy is
      exemplified in the vis viva of moving bodies, in heat,
      electric currents, etc.; potential energy, in a bent
      spring, or a body suspended a given distance above the
      earth and acted on by gravity.
{Accumulation}, {Conservation}, {Correlation}, & {Degradation
of energy}, etc. (Physics) See under {Accumulation},
   {Conservation}, {Correlation}, etc.
Syn: Force; power; potency; vigor; strength; spirit;
     efficiency; resolution.