Epistolæ
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In the civil law. Rescripts; opinions given by the emperors in cases submitted to them for decision. Answers of the emperors to petitions. The answers of counsellors, (juris-consul-ti,) as Uipian and others, to questions of law proposed to them, were also called "epistolæ." Opinions written out. The term originally signified the same as literœ.
Vicat.