a. 书信的, 用书信进行的, 书信体的

[ adj ]
written in the form of or carried on by letters or correspondence
<adj.all>
an endless sequence of epistolary love affairsthe epistolatory novel

Epistolary \E*pis"to*la*ry\, a. [L. epistolaris, fr. epistola:
cf. F. ['e]pistolaire.]
1. Pertaining to epistles or letters; suitable to letters and
correspondence; as, an epistolary style.

2. Contained in letters; carried on by letters. ``Epistolary
correspondence.'' --Addison.