LATIN DICTIONARYLexicon Latīnum
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“advertise” in Latin

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

advertise
inform, nunciare alicui aliquid (announce, by letter or by a messenger): per nuncium declarare alicui aliquid (by a messenger): certiorem facere aliquem alicujus rei or de aliqua re (give him certain information: by letter, per litteras): docere aliquem aliquid or de re (to give him information): deferre, perferre aliquid ad aliquem (to convey information to anybody): significare alicui aliquid (to give anybody to understand; especially under a promise of secrecy: to give a hint of anything: by letter, litteris or per litteras.)
To give public notice of, declarare (to announce publicly that something is going to happen; e.g., gladiatorial shows, munera: also ostendere): praedicare (to proclam by a herald, κηρύττειν, ἀνακηρύττειν): pronunciare (παραγγέλλειν publish, cause to be proclaimed by a herald; e.g., orders, names of the conquerors in games, etc.): aperire, patefacere (to spread the knowledge of).

Quick answer

What is the Latin word for advertise?
The usual Latin words for “advertise” are dēferō, dēclārō, praedicō; also aperiō, patefaciō, littera. 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.