Meaning of CORRESPONDENCE in English
[noun] [U]Any further correspondence (= letters) should be sent to my new address.He found her letter at the bottom of a pile of business correspondence.Correspondence also means the action of writing, receiving and reading letters, esp. between two people.Her correspondence with Jim lasted many years.(formal) Dr. Gillett regrets that she cannot enter into correspondence with (= will not write personally to) readers of her column.A correspondence course is a course of study in which you study at home, receiving and sending off work by post.
Cambridge English vocab. Кембриджский английский словарь. 2012