going beyond what is usual or ordinary; excessive; extreme.
an extremist, as in politics, religion, fashion, etc.
(initial capital letter) Military. the British code name for intelligence gathered by decrypting German wireless communications enciphered on the Enigma machine during World War II.
independent use of ultra-, or shortening of words prefixed with it
a prefix occurring originally in loanwords from Latin, with the basic meaning “on the far side of, beyond.” In relation to the base to which it is prefixed, ultra-, has the senses “located beyond, on the far side of” (ultramontane; ultraviolet), “carrying to the furthest degree possible, on the fringe of” (ultraleft; ultramodern), “extremely” (ultralight); nouns to which it is added denote, in general, objects, properties, phenomena, etc., that surpass customary norms, or instruments designed to produce or deal with such things (ultramicroscope; ultrasound; ultrastructure).
< Latinultrā (adv. and preposition) on the far side (of), beyond, derivative of *ult(e)r- located beyond
ne plus ultra
[ne ploo s oo l-trah; Englishnee pluhs uhl-truh, ney] /ˈnɛ ˌplʊs ˈʊl trɑ; English ˈni ˌplʌs ˈʌl trə, ˈneɪ/
prefix meaning "beyond" (ultraviolet) or "extremely" (ultramodern), from L. ultra- from ultra (adv. and prep.) "beyond, on the further side," from PIE *al- "beyond." In common use from early 19c., it appears to have arisen from Fr. political designations. As its own word, a noun meaning "extremist" of various stripes, it is first recorded 1817, from Fr. ultra, shortening of ultra-royaliste "extreme royalist."
ne plus ultra
"utmost limit to which one can go," 1638, from L., lit. "no more beyond," traditionally inscribed on the Pillars of Hercules.