IPA: /ɪˈpɪsəl/
KK: /ɪˈpɪsəl/
A written message, often formal, sent from one person to another, especially in the form of a letter.
The author wrote an epistle to his friend, sharing his thoughts on life.
Epistle → It is derived from the Greek word "epistole" (meaning a letter or message), which comes from "epistellein" (meaning to send to). An epistle is essentially a written communication or letter sent to someone.
Think of a letter being 'sent' ('epistellein') to someone — that's why an epistle is a written message.