correspondence
n. C / Un. the act of writing and receiving letters or emails. It can also mean a close connection or similarity between two things.
n. the exchange of written communications, such as letters or emails, between two or more parties. Also refers to a state of close similarity, equivalence, or agreement between different facts or ideas.
I have a lot of correspondence to answer today.
The historian spent years reading the private correspondence between the two leaders to understand their secret alliance.
The legal team discovered a significant lack of correspondence between the witness's initial testimony and the physical evidence found at the scene.
From Middle English correspondence, from Latin correspondentia. By surface analysis, correspond + -ence.
Uncountable when referring to the general activity of writing letters; countable when referring to specific points of similarity.