Definition of ne plus ultra noun from the Oxford Advanced Learner's Dictionary

 

ne plus ultra

 noun
noun
BrE BrE//ˌneɪ plʊs ˈʊltrɑː//
 
; NAmE NAmE//ˌneɪ plʊs ˈʊltrə//
 
(from Latin, formal)
 
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the perfect example of something Word OriginLatin, literally ‘not further beyond’, the supposed inscription on the mythical Pillars of Hercules prohibiting passage by ships.
See the Oxford Advanced American Dictionary entry: ne plus ultra