LATIN DICTIONARYLexicon Latīnum
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“frequency” in Latin

The English word frequency itself goes back to Latin frequēns, through frequentia.

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

frequency
frequentia (rare, except in the meaning of “a numerous assembly,” and therefore to be used with caution; e.g., as to the frequency of your letters, I make no complaint on that score, de frequentia litterarum te nihil accuso): crebritas (e.g., litterarum, officiorum, Cic.): celebritas or multitudo et celebritas (e.g., judiciorum, Cic.; celebritas periculorum, Tac.).

Quick answer

What is the Latin word for frequency?
The usual Latin words for “frequency” are frequēns, crēbritās, celebritās; also littera, officium, iūdicium. 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.