LATIN DICTIONARYLexicon Latīnum
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“maxim” in Latin

The English word maxim itself goes back to Latin maximus, through maxima.

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

maxim
Principle, axiom, ratio; institutum; lex; regula: to make it a maxim with one’s self, legem aliquem sibi imponere.
Opinion, position, opinio; consilium: good maxims, consilia recta, vera, honesta.

Quick answer

What is the Latin word for maxim?
The usual Latin words for “maxim” are ratiō, īnstituō, lēx; also rēgula, opīniō, cōnsilium. 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.