Definition of ne plus ultra noun from the Oxford Advanced American Dictionary

 

ne plus ultra

 noun
noun
NAmE//ˌneɪ plʌs ˈʌltrə//
 
, NAmE//ˌniplʌs ˈʌltrə//
 
(from Latin)(formal)
 
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the perfect example of something
See the Oxford Advanced Learner's Dictionary entry: ne plus ultra