energy

(noun) (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs. Synonyms: free energy. Example: "Energy can take a wide variety of forms."

(noun) forceful exertion. Synonyms: vigor, vigour, zip. Examples: "He plays tennis with great energy." "He's full of zip."

(noun) enterprising or ambitious drive. Synonyms: push, get-up-and-go. Example: "Europeans often laugh at american energy."

(noun) an imaginative lively style (especially style of writing). Synonyms: muscularity, vigor, vigour, vim. Examples: "His writing conveys great energy." "A remarkable muscularity of style."

(noun) a healthy capacity for vigorous activity. Synonyms: vim, vitality. Examples: "Jogging works off my excess energy." "He seemed full of vim and vigor."

(noun) any source of usable power. Example: "The doe is responsible for maintaining the energy policy."

(noun) the federal department responsible for maintaining a national energy policy of the United States; created in 1977. Synonyms: Department of Energy, Energy Department, Energy, DOE.