What does the word correspondence mean?

Usage examples for correspondence

  1. With respect to his sister, he said he was quite willing to be reconciled, and even to own himself in the wrong, if Dr. Amboyne, on reading the correspondence, should think so. – Put Yourself in His Place by Charles Reade
  2. They have been in correspondence with each other all the short time he has been in England; but although I have tried my best, I have never been able to get hold of any of their letters. – The Intriguers by William Le Queux