Radical (from Latin: ', 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 ''n''th 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), ''Radical'' (mixtape), by Odd Future, 2010 *Radical (Every Time I Die album), ''Radical'' (Every Time I Die album), 2021 *Radical (Smack album), ''Radical'' (Smack album), 1988 *Radicals (song), "Radicals" (song), a song by Tyler, The Creator from the 2011 album ''Goblin'' *"Radical", an instrumental by Dyro and Dannic, 2014

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), ''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