ne plus ultra

Isn't high school Latin fun? Ceteris paribus, fifty-cent-word-wise, it was the ne plus ultra of courses.

Ne plus ul"tra (?). [L., no further; ne no, not + plus more + ultra beyond.]

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. [Obs. or R.]

© Webster 1913