Bible Dictionaries
Ne Plus Ultra

Webster's Dictionary

(1):

The uttermost point to which one can go or attain; hence, the summit of achievement; the highest point or degree; the acme.

(2):

A prohibition against proceeding further; an insuperable obstacle or limiting condition.

Bibliography Information
Webster, Noah. Entry for 'Ne Plus Ultra'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​n/ne-plus-ultra.html. 1828.