1. Beyond in space; on the other side; trans-
2. Beyond the range or limits of; transcending; super-
3. Beyond what is ordinary, proper, or moderate; excessively; extremely

(Latin) Extreme.

Going beyond others, or beyond due limit; extreme; fanatical; uncompromising

One that is ultra; extremist
Abbreviation of Ultra Secret, term used by the British in World War II from spring 1940 to denote intelligence gained by deciphering German signals from the Enigma code-making machine.