LATIN DICTIONARYLexicon Latīnum
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“warn” in Latin

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

warn
monere, or praemonere, aliquem ut caveat. To warn of or against anything, monere or praemonere aliquid cavendum: monere or praemonere, de aliqua re: monere, ut vitet aliquis aliquid: monere, admonere, praemonere, ne. Not to scold anybody angrily, but warn him almost as a father, non inimice corripere aliquem, sedpaene patrie monere (Quint.): to suffer one’s self to be warned, audire monentem: monenti obsequi: to refuse to be warned, negligere or spernere monentem.

Quick answer

What is the Latin word for warn?
The usual Latin words for “warn” are moneō, praemoneō, admoneō. 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.