LATIN DICTIONARYLexicon Latīnum
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“grammar” in Latin

The English word grammar itself goes back to Latin grammatica, through *grammāria.

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

grammar
ars grammatica or grammatica only (Cic., Fin., 3, 2, 5), or grammatice (as Quint., 1, 4, 4), or mostly grammatica, orum (the grammar, as art and science): *ratio grammatica; ratio loquendi (as theory): *praecepta or leges grammaticorum (grammatical rules): *liber grammaticus or ad grammaticam rationem pertinens (a grammar). To write an able treatise on Latin grammar, de rations Latine loquendi accuratissime scribere.

Quick answer

What is the Latin word for grammar?
The usual Latin words for “grammar” are grammaticus, praeceptum. 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.