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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";
   - free energy
    
2. Forceful exertion
   "he plays tennis with great energy";
   - vigor [US], vigour [Brit, Cdn], zip [informal]
    
3. Enterprising or ambitious drive
   "Europeans often laugh at American energy";
   - push, get-up-and-go
    
4. An imaginative lively style (especially style of writing)
   "his writing conveys great energy";
   - muscularity, vigor [US], vigour [Brit, Cdn], vim
    
5. A healthy capacity for vigorous activity
   "jogging works off my excess energy";
   - vim, vitality
    
6. Any source of usable power
   "the DOE is responsible for maintaining the energy policy"

1. The federal department responsible for maintaining a national energy policy of the United States; created in 1977
   - Department of Energy, Energy Department, DOE

Derived forms: energies

Type of: drive, executive department, force, forcefulness, good health, healthiness, life, liveliness, physical phenomenon, spirit, sprightliness, strength

Encyclopedia: Energy, Mines and Resources Canada