Extremely radical; far beyond what is usual.

• Uncompromising or fanatical in views or methods.

An extremist, especially in politics or nationalism.

• A person with uncompromising, far-right or far-left views.

A hardcore soccer supporter in an organized group of ultras.

• Often associated with loud displays, banners, and pyrotechnics.

Short for an ultramarathon.

• A footrace longer than the standard marathon distance.

The British World War II codename for intelligence from decrypted enemy communications.

• Also the body of such decrypted information.