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energy

noun
  1. an imaginative lively style, especially style of writing
    “The author's writing conveys great energy.”
    muscularity
  2. enterprising or ambitious drive
    “Europeans often laugh at American energy”
    push
  3. forceful exertion
    “I play tennis with great energy.”
    zip
  4. any source of usable power
    “the DOE is responsible for maintaining the energy policy”
  5. (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work
    “the units of energy are joules or ergs”
    free energy
  6. a healthy capacity for vigorous activity
    “jogging works off my excess energy”
    vitality