ˌnēˌpləˈsəl.trə; ˌnāˌplu̇ˈsu̇l.trə, -ˌträ noun
( plural ne plus ultras )
Etymology: New Latin, no further
1.
a. : the highest point capable of being reached or attained : the summit of achievement : acme
the ne plus ultra of original philosophy — O.W.Holmes †1935
the most sophisticated people in the ne plus ultra of civilized society — Edith Hamilton
b. : the highest degree of a quality or state
found a small clerical job in the town — the ne plus ultra of humiliation — Van Wyck Brooks
2. archaic : a prohibition against or obstacle to further advance or achievement
her fancy of no limit dreams, no ne plus ultra bounds her schemes — Hannah More