epistle
US /ɪˈpɪs.əl/
UK /ɪˈpɪs.əl/
1.
a letter
:
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He received a long epistle from his aunt.
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The ancient texts contained many philosophical epistles.
2.
a book of the New Testament in the form of a letter from an Apostle
:
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The Epistle to the Romans is a key text in Christian theology.
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Many of the New Testament books are epistles.