What does the word pitch mean?

Usage examples for pitch

  1. The night in question was pitch dark. – The Missourian by Eugene P. (Eugene Percy) Lyle
  2. Phil stood quite still for the space of ten seconds, then the young blood in him suddenly mounted to fever pitch. – The Safety Curtain, and Other Stories by Ethel M. Dell
  3. Inside the tower it was pitch black, but they did not need lights. – The Legion of Lazarus by Edmond Hamilton