# Radical

Radical (from Latin: radix, root) may refer to:

## Politics and ideology
### Politics

* Classical radicalism, the Radical Movement that began in late 18th century Britain and spread to continental Europe and Latin America in the 19th century
* Radical politics, the political intent of fundamental societal change
* Radical Party (disambiguation), several political parties
* Radicals (UK), a British and Irish grouping in the early to mid-19th century
* Radicalization
* Politicians from the Radical Civic Union

### Ideologies

* Radical chic, a term coined by Tom Wolfe to describe the pretentious adoption of radical causes
* Radical feminism, a perspective within feminism that focuses on patriarchy
* Radical Islam, or Islamic extremism
* Radical Christianity
* Radical veganism, a radical interpretation of veganism, usually combined with anarchism
* Radical Reformation, an Anabaptist movement concurrent with the Protestant Reformation

## Science and mathematics
### Science

* Radical (chemistry), an atom, molecule, or ion with unpaired valence electron(s)
* Radical surgery, where diseased tissue or lymph nodes are removed from a diseased organ

### Mathematics

* Radical expression involving roots, also known as an nth root
** Solution in radicals
* Radical symbol (√), used to indicate the square root and other roots
* Radical of an algebraic group, a concept in algebraic group theory
* Radical of an ideal, an important concept in abstract algebra
* Radical of a ring, an ideal of "bad" elements of a ring
** Jacobson radical, consisting of those elements in a ring R that annihilate all simple right R-modules
** Nilradical of a ring, a nilpotent ideal which is as large as possible
* Radical of a module, a component in the theory of structure and classification
* Radical of an integer, in number theory, the product of the primes which divide an integer
* Radical of a Lie algebra, a concept in Lie theory
** Nilradical of a Lie algebra, a nilpotent ideal which is as large as possible
* Left (or right) radical of a bilinear form, the subspace of all vectors left (or right) orthogonal to every vector

## Linguistics

* Root (linguistics), also called a "radical", the form of a word after any prefixes and suffixes are removed
* Radical (Chinese characters), part of a Chinese character
* Radical consonant, a pharyngeal consonant
* Radical, one of the three consonants in a Semitic root

## Arts and entertainment
### Music

* Radical (mixtape), by Odd Future, 2010
* Radical (Every Time I Die album), 2021
* Radical (Smack album), 1988
* "Radicals" (song), a song by Tyler, The Creator from the 2011 album Goblin

### Architecture and design

* Radical period (design), a period in late 1960s Italian design
* Radical Baroque, an architectural style

### Literature

* Radical: Taking Back Your Faith from the American Dream, a 2010 book by Christian pastor David Platt
* Radical: My Journey out of Islamist Extremism, a 2012 memoir by British activist Maajid Nawaz

### Film

* Radical (film), a 2023 Spanish language film

## Other uses

* Murphy Radical, a Canadian light aircraft design
* Radical, Missouri, U.S., a ghost town
* Radical Sportscars, a British sports car maker
* Radical Entertainment, a Canadian video game developer
* Radical.fm, a digital music streaming service
* Radical Software, American art journal started in 1970