Noun:
1: energy (physics) 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"
2: vigour, zip, energy, vigor forceful exertion; "he plays tennis with great energy"; "he's full of zip"
3: get-up-and-go, push, energy enterprising or ambitious drive; "Europeans often laugh at American energy"
4: vigor, energy, vim, vigour, muscularity an imaginative lively style (especially style of writing); "his writing conveys great energy"; "a remarkable muscularity of style"
5: vim, vitality, energy a healthy capacity for vigorous activity; "jogging works off my excess energy"; "he seemed full of vim and vigor"
6: energy department, energy, department of energy, doe the federal department responsible for maintaining a national energy policy of the United States; created in 1977