What does the word soul mean?

Usage examples for soul

  1. Oh, this wife is the soul of my life! – A Struggle for Rome, Vol. 2 (of 3) by Felix Dahn
  2. " No, upon my soul I did not; but if all I hear be true, I believe you did. – The Bertrams by Anthony Trollope
  3. It is only by the soul that one lives. – The Eulogy of Richard Jefferies by Walter Besant