What is the meaning of Ultra?

Extreme; far beyond the norm; fanatical; uncompromising.

An ultraroyalist in France.

An extremist, especially an ultranationalist.

An especially devoted football fan, typically organized and participating in choreographies (including pyrotechnics), often of outwardly intimidating demeanour, but distinguished from a violent hooligan (although overlap between both subcultures is possible)

An ultramarathon.

An ultra-prominent peak.

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

extreme

extremist

in addition to, besides

ellipsis of ultrakevyt (“ultralight”) (aircraft that weighs very little)

ellipsis of ultraäänitutkimus

ultra, extreme

extremist

an ultraroyalist during the Bourbon Restoration period in France

ultra: beyond due limit

further, additional

beyond

beyond, further

additionally, besides

ultra, extreme

extreme

far-right

furthermore, in addition, moreover

clipping of ultraderechista: far-right extremist

ultra (devoted, hardened sports fan)

Source: wiktionary.org