What is the meaning of 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. (
  • usage: "energy can take a wide variety of forms"
  • synonyms: free energy
• Forceful exertion.
  • usage: "he plays tennis with great energy"; "he's full of zip"
  • synonyms: vigor, vigour, zip
• Enterprising or ambitious drive.
  • usage: "Europeans often laugh at American energy"
  • synonyms: push, get-up-and-go
• An imaginative lively style (especially style of writing. )
  • usage: "his writing conveys great energy"; "a remarkable muscularity of style"
  • synonyms: muscularity, vigor, vigour, vim
• A healthy capacity for vigorous activity.
  • usage: "jogging works off my excess energy"; "he seemed full of vim and vigor"
  • synonyms: vim, vitality
• Any source of usable power.
  • usage: "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.
  • synonyms: Department of Energy, Energy Department, DOE