What does the word serene mean?

Usage examples for serene

  1. Ruth's face, until Susy touched her, had been looking like a piece of heaven itself, so calm and serene were the eyes, and so beautiful the expression which lingered round her lips. – The Rebel of the School by Mrs. L. T. Meade
  2. Or was it, perhaps, the desire to be of service to His Serene Highness Prince Aribert? – The Grand Babylon Hotel by Arnold Bennett
  3. The world lay quiet and serene, as though it held no grief. – Bobby of the Labrador by Dillon Wallace