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Synonyms
en·er·gy (ĕńər-jē)

[French énergie, from Late Latin energīa, from Greek energeia, from energos, active, en-, in, at; see en–2, + ergon, work.]

noun: pl., -gies. 

  1. The capacity for work or vigorous activity; vigor; power. See synonyms at strength
    1. Exertion of vigor or power: a project requiring a great deal of time and energy.
    2. Vitality and intensity of expression: a speech delivered with energy and emotion.
    1. Usable heat or power: Each year Americans consume a high percentage of the world's energy.
    2. A source of usable power, such as petroleum or coal.
  4. Physics The capacity of a physical system to do work.