LATIN DICTIONARYLexicon Latīnum
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“accent” in Latin

The English word accent itself goes back to Latin canō, through accentus.

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

accent v.
in pronunciation, certum vocis admovere sonum; cum sono quodam vocis pronuntiare.
In writing, apponere syllabae notam or apicem (the last, if it is long).
accent s.
in pronunciation, vocis sonus (Cic.): accentus, tenor (Quint.): tonus (Nigidius, ap. Gell., 13, 25). Acute accent, sonus vocis acutus.
In writing, vocis nota (Gell., 13, 6): apex (the mark of a long syllable, but different from the circumflex. Spald., Quint., 1, 5, 23). To place an accent. Vid. ACCENT, v.

Quick answer

What is the Latin word for accent?
The usual Latin words for “accent” are apex, accentus, tenor; also tonus, Nigidius. 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.