definition of the word energy

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

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

• synergy
• ergonomics

Definition from Wiktionary Content avaible with GNU Free Documentation License

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