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