LATIN DICTIONARYLexicon Latīnum
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“calendar” in Latin

The English word calendar itself goes back to Latin calō, through calendarium.

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

calendar s.
calendarium (originally, a book of debts or interest; in modern Latin, a calendar, Inscript., Gruteri, 133, to be retained as a technical term): fasti (the book in which the dies fasti et nefasti, the dies senatus et comitiales. etc, were registered): ephemeris, idis, f. (a day-book of expenses, events, etc.).

Quick answer

What is the Latin word for calendar?
The usual Latin words for “calendar” are calendārium, faveō, ephēmeris; also fīlius. 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.