Hear it pronouncedRadical
Radical (from Latin radicis, genitive of radix "root") can refer to many different things and concepts.
[ Mathematics
- The symbol √ used to indicate the square root or nth root
- Radical of an algebraic group, a concept in algebraic group theory
- Radical of an ideal, an important concept in abstract algebra
- Radical of an integer, a concept in number theory
- Symmetric bilinear form, a concept in linear algebra
- Radical of a Lie algebra, a concept in Lie theory
[ Chemistry
[ Linguistics
- Radical consonant, which involves the root of the tongue
- Radical (Chinese character), part of a Chinese character under which it is indexed in a dictionary (also called bùshǒu 部首)
- One of the three consonants in a Semitic trilateral or quadrilateral root
[ Society
- Political radicalism
- Radicalism (historical), the Radical Movement which began in late 18th century Britain and spread to continental Europe and Latin America in the 19th century
- Radical left, another term for the far left
- Radical right, another term for the far right
- Extremism, political standpoints that are perceived as revolutionary or extreme
- Radical Whigs, influential early writers on Radicalism
- Radical Republican (USA), a member of an influential group of American politicians during the Civil War reconstruction
- Radical Party, one of a number of political parties around the world
- Radicals (UK), parliamentary progressives who were part of the nineteenth-century Liberal coalition
- Industrial Radicals, members of the fictional Industrial Radical Party
- Religious radicalism
[ Businesses and organizations
- Radical Sportscars, an English sports car maker
- Radical Entertainment, a video game developer based in Vancouver, Canada
- Free Radical Design, a video game developer based in Nottingham, England
- Free Radicals (band), a jazz-funk musical group from Houston, TX
- Radical Matters, a record label
- Free Radical Centre
