What does the word energy mean?

Usage examples for energy

  1. And at such times I haven't the energy to fight against it or to try to overcome it. – Renée Mauperin by Edmond de Goncourt and Jules de Goncourt
  2. Show a little energy. – Dr. Adriaan by Louis Couperus
  3. He would at once take Arctura's education in his own hands, and give his full energy to it! – Donal Grant by George MacDonald