Definition of "correspondence"

Mutual communication or discourse:

1. (uncountable, obsolete) Friendly discussion.

2. (uncountable) Reciprocal exchange of civilities, especially conversation between persons by means of letters.  examples

3. (uncountable) Newspaper or news stories.  examples

4. (countable or uncountable) Postal or other written communications.  quotations  examples

   Quotations

   • I'm doing time in Oklahoma and really would appreciate some correspondence.

     1985 April 13, Michael Harmon, “Personal advertisement”, in Gay Community News, page 14

Congruity or similarity between different things, people, etc:

1. (countable) An agreement of situations or objects with an expected outcome.  examples

2. (set theory, countable) A relation.  examples

3. (theology, Swedenborgianism) A similarity between physical and spiritual things (e.g. light to wisdom, or warmth to love)