- a quantity expressed as a root of another quantity.
- the set of elements of a ring, some power of which is contained in a given ideal.
- radical sign.
Origin of radical
Synonyms for radical
Antonyms for radical
Examples from the Web for ultra-radical
Historical Examples of ultra-radical
All parties liked him except the ultra-radical dreg of the canaille.Miss Eden's Letters
What surprised people at first was the singular combination of literary culture and ultra-Radical opinion.Modern Leaders: Being a Series of Biographical Sketches
A sharp argumentum ad hominem, for the benefit of the ultra-radical accuser closes this division of his defence.
With the regiment comes Roger Ellis, a man of middle age, and an ultra-radical.
Blunt in his manners, he was ultra-radical in his opinions,—a proud member of New Zealand's working class.The Pacific Triangle
Word Origin for radical
late 14c., in a medieval philosophical sense, from Late Latin radicalis "of or having roots," from Latin radix (genitive radicis) "root" (see radish). Meaning "going to the origin, essential" is from 1650s. Radical sign in mathematics is from 1680s.
Political sense of "reformist" (via notion of "change from the roots") is first recorded 1802 (n.), 1817 (adj.), of the extreme section of the British Liberal party (radical reform had been a current phrase since 1786); meaning "unconventional" is from 1921. U.S. youth slang use is from 1983, from 1970s surfer slang meaning "at the limits of control." Radical chic is attested from 1970; popularized, if not coined, by Tom Wolfe. Radical empiricism coined 1897 by William James (see empiricism).
1630s, "root part of a word, from radical (adj.) Political sense from 1802; chemical sense from 1816.
In politics, someone who demands substantial or extreme changes in the existing system.