Pronunciation: (i-pis'ul), [key]
1. a letter, esp. a formal or didactic one; written communication.
2. (usually cap.) one of the apostolic letters in the New Testament.
3. (often cap.) an extract, usually from one of the Epistles of the New Testament, forming part of the Eucharistic service in certain churches.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.