Merriam-Webster Online Dictionary
epistle (noun)1.
capitalized
a) one of the letters adopted as books of the New Testament
b) a liturgical lection usually from one of the New Testament Epistles
2.
a) - letter , especially a formal or elegant letter
b) a composition in the form of a letter
Merriam-Webster Online Thesaurus
epistle (noun)a message on paper from one person or group to another
SYNONIMS:
dispatch, epistle, memo, memorandum, missive, noteRELATED WORDS:
billet-doux, open letter; airmail, card, electronic mail, e-mail, junk mail, mail, postal card, postcard; communication, report; encyclical