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

Politics and ideology

Politics

Classical radicalism Radicalism (from French ) was a political movement representing the leftward flank of liberalism between the late 18th and early 20th century. Certain aspects of the movement were precursors to a wide variety of modern-day movements, ranging f ...

, the Radical Movement that began in late 18th century Britain and spread to continental Europe and Latin America in the 19th century *

Radical politics Radical politics denotes the intent to transform or replace the principles of a society or political system, often through social change, structural change, revolution or radical reform. The process of adopting radical views is termed radic ...

, the political intent of fundamental societal change * Radical Party (disambiguation), several political parties *

Radicals (UK) The Radicals were a loose parliamentary political grouping in Great Britain and Ireland in the early to mid-19th century who drew on earlier ideas of radicalism and helped to transform the Whigs into the Liberal Party. History Early Rad ...

, a British and Irish grouping in the early to mid-19th century *

Radicalization Radicalization (or radicalisation) is the process by which an individual or a group comes to adopt increasingly radical views in opposition to a political, social, or religious status quo. The ideas of society at large shape the outcomes of rad ...

*Politicians from the

Radical Civic Union The Radical Civic Union (, UCR) is a major political party in Argentina. It has reached the national government on ten occasions, making it one of the most historically important parties in the country. Ideologically, the party has stood for r ...

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 A solution in radicals or algebraic solution is an expression of a solution of a polynomial equation that is algebraic, that is, relies only on addition, subtraction, multiplication, division, raising to integer powers, and extraction of ...

* 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 In mathematics, a bilinear form is a bilinear map on a vector space (the elements of which are called '' vectors'') over a field ''K'' (the elements of which are called '' scalars''). In other words, a bilinear form is a function that is linea ...

, the subspace of all vectors left (or right) orthogonal to every vector

Linguistics

Root (linguistics) A root (also known as a root word or radical) is the core of a word that is irreducible into more meaningful elements. In morphology, a root is a morphologically simple unit which can be left bare or to which a prefix or a suffix can attach. ...

, also called a "radical", the form of a word after any prefixes and suffixes are removed *

Radical (Chinese characters) A radical (), or indexing component, is a visually prominent Chinese character components, component of a Chinese character under which the character is traditionally listed in a Chinese dictionary. The radical for a character is typically a s ...

, part of a Chinese character * Radical consonant, a pharyngeal consonant *Radical, one of the three consonants in a

Semitic root The roots of verbs and most nouns in the Semitic languages are characterized as a sequence of consonants or " radicals" (hence the term consonantal root). Such abstract consonantal roots are used in the formation of actual words by adding the vowel ...

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'' *"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), 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