Definition of epistolize in English:
epistolize
(also epistolise)
verb ɪˈpɪstəlʌɪzɪˈpɪst(ə)lʌɪz
rare, literary no object To write a letter.
Origin
Mid 17th century; earliest use found in James Howell (?1594–1666), historian and political writer. From classical Latin epistola epistle + -ize.