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“september” in Latin

The English word september itself goes back to Latin septem, through September.

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

september
mensis September (Cic.); September (Varr., L.L.). The Calends (Nones, Ides) of September, Calendae (Nonae, Idus) Septembres

Quick answer

What is the Latin word for september?
The usual Latin words for “september” are September, kalendae, nōnus; also īdūs. 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.