Definition of epistolical in US English:

epistolical

adjective

literary
  • Epistolary.

Origin

Early 17th century; earliest use found in Thomas Adams (1583–1652), Church of England clergyman. From classical Latin epistolicus or its etymon ancient Greek ἐπιστολικός epistolic + -al.

Pronunciation

epistolical

/ˌɛpɪˈstɒlɪkl/