Definition of ne plus ultra in English:

ne plus ultra

noun

the ne plus ultra
  • The perfect or most extreme example of its kind; the ultimate.

    ‘he became the ne plus ultra of bebop trombonists’
    the last word, the ultimate example, the best example, the perfect example, the ultimate, the height, the acme, the zenith, the culmination, the epitome, the quintessence, perfection, the nonesuch
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Origin

Latin, literally ‘not further beyond’, the supposed inscription on the Pillars of Hercules prohibiting passage by ships.

Pronunciation

ne plus ultra

/ˌneɪ plʊs ˈʊltrɑː/