Definition of epistolary adjective from the Oxford Advanced Learner's Dictionary

 

epistolary

 adjective
adjective
BrE BrE//ɪˈpɪstələri//
 
; NAmE NAmE//ɪˈpɪstəleri//
 
(formal)
 
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written or expressed in the form of letters an epistolary novel Word Origin mid 17th cent.: from French épistolaire or Latin epistolaris, from epistola, from Greek epistolē, from epistellein ‘send news’, from epi ‘upon, in addition’ + stellein ‘send’.
See the Oxford Advanced American Dictionary entry: epistolary