What does the word lighter mean?

Usage examples for lighter

  1. " It is well that I came home, for I can await Caesar with a much lighter heart. – The Complete Historical Romances of Georg Ebers by Georg Ebers
  2. It's getting lighter, too. – Lost Farm Camp by Harry Herbert Knibbs
  3. Dear- dearest- if I feel that you love me, can I help it if, without any other sort of certain knowledge, the world grows lighter round me? – The Letters of Robert Browning and Elizabeth Barrett Barrett, Vol. 1 (of 2) 1845-1846 by Robert Browning and Elizabeth Barrett Barrett