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“motto” in Latin

The English word motto itself goes back to Latin mūtus, through muttum.

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

motto
sententia; dictum (Cic.): his motto was, hoc dictum usurpare, or in ore habere, solebat: I take it as my motto, meum illud verbum facio (Tac.).

Quick answer

What is the Latin word for motto?
The usual Latin words for “motto” are sententia, dīcō, soleō. 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.