Answer:
: communication by letters or e-mail
also : the letters or emails exchanged
I have a pile of correspondence on my desk.
b: the news, information, or opinion contributed by a correspondent to a newspaper or periodical
-2a: the agreement of things with one another
the correspondence between spelling and pronunciation
b: a particular similarity
c: a relation between sets in which each member of one set is associated with one or more members of the other
— compare FUNCTION sense 5a/