LATIN DICTIONARYLexicon Latīnum
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“daily” in Latin

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

daily
quotidianus (happening every day, customary; but not necessarily taking up the whole day): diurnus (recurring every day, and having some reference to the whole day). Daily food, victus quotidianus (one’s usual daily food); cena quotidiana (one’s usual dinner; opposed to cena magnifica); victus diurnus; cibus diurnus (daily rations, the rations prepared for the whole day; e.g., of the slaves): to seek their daily bread, victum diurnum quaerere.
daily adv.
quotidie; in dies singulos (quotidie applies to things that are daily repeated; in singulos dies, to things that, from day to day, increase or decrease; Cic., Att., 5, 7. Quotidie, vel potius in singulos dies breviores litteras ad te mitto, Döderlein).

Quick answer

What is the Latin word for daily?
The usual Latin words for “daily” are cotīdiānus, diurnus, cotīdiē. 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.