A small or brief epistle; a short letter or note.
From epistle plus the diminutive suffix -et, which creates words meaning 'small version of X,' as in booklet or leaflet. This formation emphasizes brevity or informality.
The -et ending gives this word a cute, diminutive quality—imagine Tolstoy writing epistles and a child writing epistolets; it's the difference between War and Peace and a postcard!
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