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(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs;
"energy can take a wide variety of forms"
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forceful exertion;
"he plays tennis with great energy"
"he's full of zip"
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enterprising or ambitious drive;
"Europeans often laugh at American energy"
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an imaginative lively style (especially style of writing);
"his writing conveys great energy"
"a remarkable muscularity of style"
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a healthy capacity for vigorous activity;
"jogging works off my excess energy"
"he seemed full of vim and vigor"
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any source of usable power;
"the DOE is responsible for maintaining the energy policy"
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the federal department responsible for maintaining a national energy policy of the United States; created in 1977