energy

Từ điển American Heritage Dictionary 4th

en·er·gy (ĕnʹər-jē)n. pl. en·er·gies
1. The capacity for work or vigorous activity; vigor; power. See Synonyms at strength.
2.
a. Exertion of vigor or power:
a project requiring a great deal of time and energy.
b. Vitality and intensity of expression:
a speech delivered with energy and emotion.
3.
a. Usable heat or power:
Each year Americans consume a high percentage of the world's energy.
b. A source of usable power, such as petroleum or coal.
4. Physics. The capacity of a physical system to do work. [French énergie, from Late Latin energīa, from Greek energeia, from energos, active : en-, in, at; see en-² + ergon, work; See werg- in Indo-European Roots.]

• Từ đồng nghĩa / Synonyms:
  Department of Energy, Energy Department, Energy, DOE, vim, vitality, muscularity, vigor, vigour, push, get-up-and-go, zip, free energy