1. • noun - (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work
   • noun - forceful exertion
   • noun - enterprising or ambitious drive
   • noun - an imaginative lively style (especially style of writing)
   • noun - a healthy capacity for vigorous activity
   • noun - any source of usable power
   • noun - the federal department responsible for maintaining a national energy policy of the United States
2. • The capacity for work or vigorous activity; vigor; power.
   • Exertion of vigor or power: a project requiring a great deal of time and energy.
   • Vitality and intensity of expression: a speech delivered with energy and emotion.
   • Usable heat or power: Each year Americans consume a high percentage of the world’s energy.
   • A source of usable power, such as petroleum or coal.
   • The capacity of a physical system to do work.
3. • n - the capacity for vigorous activity

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