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definition of the word energy

by the Wiktionnary

From Ancient Greek ἐνέργεια (energeia), action, act, work) < ἐνεργός (energos), active) < ἐν (en), in) + ἔργον (ergon), work).

Singular
energy

Plural
energies

energy (plural energies)

  1. The impetus behind all motion and all activity.
  2. The capacity to do work.
  3. (physics) A quantity that denotes the ability to do work and is measured in a unit dimensioned in mass × distance²/time² (ML²/T²) or the equivalent.
    • Units:
    SI: joule (J), kilowatt-hour (kW·h)
    CGS: erg (erg)
    Customary: foot-pound-force, calorie, kilocalorie (i.e. dietary calories), BTU, liter-atmosphere, ton of TNT


Definition from Wiktionary
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