- (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"
- forceful exertion;
"he plays tennis with great energy" "he's full of zip"
- enterprising or ambitious drive;
"Europeans often laugh at American energy"
- an imaginative lively style (especially style of writing);
"his writing conveys great energy" "a remarkable muscularity of style"
- a healthy capacity for vigorous activity;
"jogging works off my excess energy" "he seemed full of vim and vigor"
- any source of usable power;
"the DOE is responsible for maintaining the energy policy"
- the federal department responsible for maintaining a national energy policy of the United States; created in 1977
