[epis.to.lary] adj (ca. 1656) 1: of, relating to, or suitable to a letter
2: contained in or carried on by letters "an endless sequence of ... ~ love affairs --Times Lit. Supp."
3: written in the form of a series of letters "~ novel"
[2]epistolary n, pl -lar.ies (ca. 1900): a lectionary containing a body of liturgical epistles