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“ne plus ultra” in Latin

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

ne plus ultra
summum; perfectissimum; quo magis, melius, perfectius esse, fieri, fingi, nihil potest (after Cic.); or by circumlocution; e.g., nihil illo est excellentius in virtute (Nep.); mulier est omnibus simulacris emendatior (Petronius, 126, 13).

Quick answer

What is the Latin word for ne plus ultra?
The usual Latin words for “ne plus ultra” are summus, perfectus, bonus; also faciō, fingō, Petrōnius. 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.