D defs.my
Entry 2 senses Webster, 1913

Epistolary

/ĭp-ĭs'-təl-ĕrˌ-ē/ · E·pis·to·la·ry · IPA /ɪˈpɪstəˌlɛɹi/
01 a. Pertaining to epistles or letters; suitable to letters and correspondence; as, an epistolary style.
  1. 1.
    Pertaining to epistles or letters; suitable to letters and correspondence; as, an epistolary style.
  2. 2.
    Contained in letters; carried on by letters.