ultraadj/ˈʌltɹə/

• 1

  Extreme; far beyond the norm; fanatical; uncompromising.

  • an ultra reformer; ultra measures

ultranoun/ˈʌltɹə/

• 1

  A political extremist, in particular

  • Five militants were nabbed while four ultras of Harkat-ul-Jehad-e-Islami (HuJI) gave themselves up.
• 2

  A political extremist, in particular:

• 3

  A political extremist, in particular:

• 4

  historicalA political extremist, in particular:

  • Her soirées were among the most agreeable at Paris—she united all the rank and talent to be found in the ultra party, for she professed to be quite a female Mæcenas; […]
  • "At any rate that is what he explained to me," I said hastily while the lawyer rubbed his long ultra's nose and sighed.
• 5

  ball-gamesgameshobbiesAn 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)

  • A similar view is expressed by a Turin supporter in Segre's study, but in this case it is more specifically addressed to how powerful teams, such as Juventus, get preferential treatment in reports on the negative aspects of the ultras world.
  • If a member of an official football club can be said to be a citizen of the football world, an ultra has to be considered as a militant.
• 6

  athleticshobbieslifestyleAn ultramarathon.

  • I've done more than forty marathons and ultras and have won a handful of small boutiquey races in mountainous, out-of-the-way places: the foothills of the Sierra Nevada; Mount Mitchell, North Carolina; Bozeman, Montana; and, on the third day of a 100-mile stage race, the Mount Everest Challenge Marathon in the Himalayas.
• 7

  climbinghobbieslifestyleAn ultra-prominent peak.

  • Blanca Peak is one of just three ultra-prominence peaks, or “ultras,” in the state and the highpoint of the Sierra Blanca Range, a massif that includes ranked 14ers Ellingwood Point, Little Bear Peak, and Mount Lindsey.
• 8

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