LATIN DICTIONARYLexicon Latīnum
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“digit” in Latin

The English word digit itself goes back to Latin digitus.

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

digit
digitus (1-10th of the Roman pes).
The mark that represents a number under ten; littera: *nota numeri (littera the ancient term, because their numerals were letters, to which a numerical value was assigned). OBS. When a “digit” is used for a fraction, as in speaking of an eclipse, it must be turned into its value, and translated accordingly.

Quick answer

What is the Latin word for digit?
The usual Latin words for “digit” are digitus, littera. 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.