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  1. en·er·gy
  2. noun

  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:

    • 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.

    • 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

      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

      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

      the energy in a system arising from the relative positions and interactions of its parts.
    • noun

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

      a thermodynamic quantity equivalent to the capacity of a system to do work.
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