LATIN DICTIONARYLexicon Latīnum
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“advertisement” in Latin

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

advertisement
indicium, significatio (both as the act of giving information and information given): nuncius (information given, especially by a messenger, but also generally).
Declaration, public notice, praedicatio, pronunciatio. (SYN. in ADVERTISE).
Admonition, monitio, admonitio (action and thing): monitum, admonitum: praeceptum (as thins).

Quick answer

What is the Latin word for advertisement?
The usual Latin words for “advertisement” are indicium, significātiō, nūntius; also praedicātiō, prōnūntiātiō, monitiō. 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.