Etymology
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epistolary (adj.)

1650s, from French épistolaire, from Late Latin epistolarius "of or belonging to letters," from Latin epistola "a letter, a message" (see epistle). In Middle English as a noun (early 15c.), "book containing epistles read in the Mass," from Medieval Latin epistolarium.

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Definitions of epistolary

epistolary (adj.)
written in the form of or carried on by letters or correspondence;
an endless sequence of epistolary love affairs
Synonyms: epistolatory
From wordnet.princeton.edu