What does the word exchange mean?

Usage examples for exchange

  1. Their conversation was the intimate exchange of thought of old friends; but there was nothing of love. – Wife in Name Only by Charlotte M. Braeme (Bertha M. Clay)
  2. Send for U. S. Exchange list. – History of the Postage Stamps of the United States of America by John Kerr Tiffany
  3. I guess I could give up the ship's cat in exchange for a girl or two. – Angel Island by Inez Haynes Gillmore