Define: e·pis·to·lar·y

e·pis·to·lar·y  [ih-pis-tl-er-ee]

–adjective 

1. 

contained in or carried on by letters: an epistolary friendship.

2. 

of, pertaining to, or consisting of letters.

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epistolary. (n.d.). Dictionary.com Unabridged. Retrieved October 18, 2010, from Dictionary.com website: http://dictionary.reference.com/browse/epistolary

Epistolary Novels

84, Charing Cross Road by Helene Hanff