What does the word freak mean?

Usage examples for freak

  1. We used to think it was a freak notion of his for keeping in health. – Dawson Black: Retail Merchant by Harold Whitehead
  2. What astonishing freak is this, Stanninghame? – The Sign of the Spider by Bertram Mitford
  3. I think Mr. Cameron is a freak, anyway. – Patty's Suitors by Carolyn Wells