Ultra vs. Infra

Ultraadjective

Extreme; far beyond the norm; fanatical; uncompromising.

Ultranoun

An ultraroyalist in France.

Ultranoun

An extremist.

Ultranoun

(soccer) An especially devoted football fan, typically associated with the intimidating use of extremist slogans, pyrotechnics and sometimes hooligan violence.

Ultranoun

(athletics) An ultramarathon.

Ultranoun

(climbing) An ultra-prominent peak.

Ultranoun

Code name used by British codebreakers during World War 2 for decrypted information gained from the enemy.

Ultraadjective

Going beyond others, or beyond due limit; extreme; fanatical; uncompromising; as, an ultra reformer; ultra measures.

Ultranoun

One who advocates extreme measures; an ultraist; an extremist; a radical.

Ultraadjective

(used of opinions and actions) far beyond the norm;

Ultranoun

an extremist

Ultranoun

short for ultramarathon

Ultra

Ultra was the designation adopted by British military intelligence in June 1941 for wartime signals intelligence obtained by breaking high-level encrypted enemy radio and teleprinter communications at the Government Code and Cypher School (GC&CS) at Bletchley Park. Ultra eventually became the standard designation among the western Allies for all such intelligence.

Infraadverb

(legal) Used to refer to something discussed later.

Infranoun

Infrastructure.

Infraadverb

Below; beneath; under; after; - often used as a prefix.

Infraadverb

(in writing) see below;