What does the word Whether mean?

Usage examples for Whether

  1. I don't know whether I shall know him. – The Burial of the Guns by Thomas Nelson Page
  2. I don't care whether I ever get it or not. – The Mysterious Rider by Zane Grey
  3. " I don't know whether I ought to be nice to you or not, Captain Merrithew," she said. – Dan Merrithew by Lawrence Perry