ne plus ultra

From Latin nē (“not”) plūs (“more”) ultrā (“beyond”).

• enPR: /nē' plŭs ŭl'trə/

ne plus ultra (plural ne plus ultras)

1. The highest, ultimate point of achievement which can be reached; perfection.
   • Julia Kavanagh

     The slight that can be conveyed in a glance, in a gracious smile, in a wave of the hand, is often the ne plus ultra of art.

2. The perfect or most extreme example of its kind; the ultimate.
3. (rare) A prohibition against proceeding further; an insuperable obstacle or limiting condition.