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  1. en·er·gy
    IPA[ˈenərjē]
  2. noun

    • 1. the strength and vitality required for sustained physical or mental activity:

      changes in the levels of vitamins can affect energy and well-being
      Synonym : vitality, vigor, life, liveliness, animation, vivacity, spirit, spiritedness, fire, passion, ardor, zeal, verve, enthusiasm, zest, vibrancy, spark, sparkle, effervescence, exuberance, buoyancy, perkiness, sprightliness, strength, stamina, forcefulness, power, might, potency, dynamism, drive, push, zip, zing, pep, pizzazz, punch, bounce, fizz, oomph, go, get-up-and-go, vim and vigor, feistiness
    • 2. a person's physical and mental powers, typically as applied to a particular task or activity:

      an alternative is to devote your energies to voluntary work
    • 3. power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines:

      nuclear energy
      Synonym : power
    • 4. 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
    • 5. a degree or level of energy possessed by something or required by a process:

      gamma rays at different energies
  3. Variation

    • n.: noun: energy, plural noun: energies

    • noun

      the strength and vitality required for sustained physical or mental activity:

      a person's physical and mental powers:

    • adjective

      (of food) having a high calorie content in relation to its weight:

      (of fuel or a battery) storing a large amount of energy in relation to its volume:

    • noun

      the prevention of the wasteful use of energy, especially in order to ensure its continuing availability:

      the principle by which the total energy remains constant in a system that is not subject to external influence.

    • noun

      radiant energy emitted by the sun.

      another term for solar power

    • noun

      mass and energy regarded as interconvertible manifestations of the same phenomenon, according to the laws of relativity.

      the mass of a body regarded relativistically as energy.

    • noun

      the minimum quantity of energy which the reacting species must possess in order to undergo a specified reaction.
    • noun

      any of various types of beverage that are considered a source of energy, especially a soft drink containing a high percentage of sugar and/or caffeine or other stimulant.
    • noun

      a plant grown for use in the generation of energy or the production of fuels such as bioethanol:
    • noun

      the energy that holds a nucleus together, equal to the mass defect of the nucleus.
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