energy meaning and definition

ENERGY noun

Definition of energy (noun)

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