LATIN DICTIONARYLexicon Latīnum
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“oratory” in Latin

The English word oratory itself goes back to Latin ōrō, through ōrātōrium.

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

oratory
Art of speaking, ars dicendi, ars oratoria or rhetorica, or simply rhetorica (general term); dicendi ratio (as theory). Oratory of the bar, genus dicendi judiciis aptum; eloquentia forensis: a teacher of oratory, dicendi magister; rhetor: to teach oratory, dicendi praecepta tradere.
A private chapel, *sacellum: *aedicula.

Quick answer

What is the Latin word for oratory?
The usual Latin words for “oratory” are rhētoricus, sacellum, aedicula; also rhētor. 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.