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The capacity for work or vigorous activity; vigor; power. See Synonyms at strength.
(noun)
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Exertion of vigor or power: a project requiring a great deal of time and energy.
(noun)
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Vitality and intensity of expression: a speech delivered with energy and emotion.
(noun)
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Usable heat or power: Each year Americans consume a high percentage of the world's energy.
(noun)
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A source of usable power, such as petroleum or coal.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.