What does the word depression mean?

Usage examples for depression

  1. Her depression seemed to lift a little. – The Way of Ambition by Robert Hichens
  2. At home there was more surface depression. – The Amazing Interlude by Mary Roberts Rinehart
  3. In the thought of the former we see expressed nothing but profound depression, fear and selfishness. – Thought-Forms by Annie Besant C.W. Leadbeater