LATIN DICTIONARYLexicon Latīnum
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“exposition” in Latin

The English word exposition itself goes back to Latin pōnō, through expositiō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

exposition
Explanation, etc, explanatio: interpretatio: explicatio: enarratio: enucleatio [SYN. in EXPLANATION]: ☞ expositio (an oratorical term) ... speciatim dicitur, cum post narrationem res, de quibus in oratione dicturi sumus, breviter et absolute exponimus. Ita certe definit Auct. Herenn., 1, 10. Ab ea diversa esse videtur, quam Cic., Or., 3, 53, “expositionem sententiae suae” appellat. Quint. simpliciter pro narratione dixisse expositionem videtur, Ernesti.
Act of exposing, or state of being exposed, expositio (late, of a child, Justinus, 1, 4). By circumlocution.

Quick answer

What is the Latin word for exposition?
The usual Latin words for “exposition” are explānātiō, interpretātiō, explicātiō; also ēnārrātiō, ēnūcleātiō, expositiō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.