What does the word either mean?

Usage examples for either

  1. And I don't need any one to wait on me, either. – Jack of the Pony Express by Frank V. Webster
  2. And don't you forget, either, that it was Westy that saved it for us. – Roy Blakeley's Camp on Wheels by Percy Keese Fitzhugh
  3. Yes, but he didn't get Dulaq, either. – The Dueling Machine by Benjamin William Bova Myron R. Lewis