cor·re·spon·dence 
/ˌkorəˈspɑ:ndəns/ noun
plural cor·re·spon·denc·es /ˌkorəˈspɑ:ndəns/ noun 1 : the activity of writing letters or e-mails to someone [noncount] ▪ They communicated by telephone and correspondence. ▪ E-mail correspondence has become extremely important for modern businesses. [singular] ▪ The two men began a correspondence that would continue throughout their lives. 2 [noncount] : the letters or e-mails that people write to each other
▪ A book of the author's personal correspondence was published early last year. ▪ A formal tone is always used in business correspondence. ▪ I have a pile of correspondence [=letters from people] on my desk. 3 : a direct relationship to or with something or between two things [noncount] ▪ Note the correspondence of each number to a location on the map. ▪ Sometimes there is little correspondence between the way a word is spelled and the way it is pronounced in English. [count] ▪ Sometimes there are few correspondences between spelling and pronunciation. 4 : the fact of being similar or equal to something [noncount] ▪ The degree of correspondence between the two texts is startling. [=it is startling to see how closely they resemble each other] [count] ▪ There is a close correspondence between the two texts. ▪ There are many correspondences between them.
▪ A book of the author's personal correspondence was published early last year. ▪ A formal tone is always used in business correspondence. ▪ I have a pile of correspondence [=letters from people] on my desk.
