The Collaborative International Dictionary of English v.0.48:

Energy \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.
      [1913 Webster]

            The great energies of nature are known to us only by
            their effects.                        --Paley.
      [1913 Webster]

   2. Power efficiently and forcibly exerted; vigorous or
      effectual operation; as, the energy of a magistrate.
      [1913 Webster]

   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.
      [1913 Webster]

   4. (Physics) Capacity for performing work.
      [1913 Webster]

   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.
         [1913 Webster]

   Accumulation, Conservation, Correlation, & Degradation
   of energy, etc. (Physics) See under Accumulation,
      Conservation, Correlation, etc.

   Syn: Force; power; potency; vigor; strength; spirit;
        efficiency; resolution.
        [1913 Webster]

WordNet (r) 3.0 (2006):

energy
    n 1: (physics) a thermodynamic quantity equivalent to the
         capacity of a physical system to do work; the units of
         energy are joules or ergs; "energy can take a wide variety
         of forms" [syn: energy, free energy]
    2: forceful exertion; "he plays tennis with great energy"; "he's
       full of zip" [syn: energy, vigor, vigour, zip]
    3: enterprising or ambitious drive; "Europeans often laugh at
       American energy" [syn: energy, push, get-up-and-go]
    4: an imaginative lively style (especially style of writing);
       "his writing conveys great energy"; "a remarkable muscularity
       of style" [syn: energy, muscularity, vigor, vigour,
       vim]
    5: a healthy capacity for vigorous activity; "jogging works off
       my excess energy"; "he seemed full of vim and vigor" [syn:
       energy, vim, vitality]
    6: any source of usable power; "the DOE is responsible for
       maintaining the energy policy"
    7: the federal department responsible for maintaining a national
       energy policy of the United States; created in 1977 [syn:
       Department of Energy, Energy Department, Energy, DOE]

Moby Thesaurus II by Grady Ward, 1.0:

148 Moby Thesaurus words for "energy":
   activity, amperage, animation, application, ardor, armipotence,
   assiduity, assiduousness, authority, beef, birr, black power,
   breeziness, briskness, brute force, bubbliness, charge, charisma,
   clout, cogence, cogency, compulsion, concentration, dash,
   decisiveness, determination, diligence, dint, drive, duress,
   dynamism, ebullience, effect, effectiveness, effectuality,
   effervescence, efficacy, effort, elan, elbow grease, endeavor,
   endurance, energeticalness, exertion, fervor, flower power, force,
   force majeure, forcefulness, fortitude, full blast, full force,
   get-up-and-go, go, guts, gutsiness, hard pull, hardihood,
   hardiness, heartiness, indefatigability, industriousness, industry,
   influence, intensity, intestinal fortitude, laboriousness, life,
   liveliness, long pull, lustihood, lustiness, main force,
   main strength, mana, might, might and main, mightiness, moxie,
   muscle, muscle power, nerve and sinew, obstinacy, pains, pep,
   peppiness, piss and vinegar, pizzazz, poop, potence, potency,
   potentiality, power, power pack, power structure, power struggle,
   powerfulness, prepotency, productiveness, productivity, puissance,
   pull, punch, push, relentlessness, robustness, ruggedness,
   sedulity, sedulousness, sinew, spirit, spiritedness, sprightliness,
   stalwartness, stamina, staying power, steam, sticking power,
   stoutness, strength, strength of will, strenuousness, strong arm,
   sturdiness, superiority, superpower, tirelessness, toughness,
   trouble, tuck, unsparingness, validity, vehemence, verve, vigor,
   vigorousness, vim, virility, virtue, virulence, vitality,
   vivaciousness, vivacity, wattage, weight, zealousness, zing, zip



U.S. Gazetteer Places (2000):

Energy, IL -- U.S. village in Illinois
   Population (2000):    1175
   Housing Units (2000): 519
   Land area (2000):     1.185826 sq. miles (3.071276 sq. km)
   Water area (2000):    0.008844 sq. miles (0.022907 sq. km)
   Total area (2000):    1.194670 sq. miles (3.094183 sq. km)
   FIPS code:            24166
   Located within:       Illinois (IL), FIPS 17
   Location:             37.772398 N, 89.025519 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Energy, IL
    Energy