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Webster's Dictionary (1865)

E-pis'to-la-ry, a.

adjective

a. [Lat. epistolaris, from epistola; Fr. épistolaire, Pr., Sp., & Pg. epistolar, It. epistolare. See supra.]

  1. Pertaining to epistles or letters; suitable to letters and correspondence; as, an epistolary style.
  2. Contained in letters; carried on by letters. “A free epistolary correspondence.” W. Mason.