Radical may refer to:

Politics and ideology

Politics

* Radical politics, the political intent of fundamental societal change *

Radicalism (historical) Radicalism (from French , "radical") or classical radicalism was a historical political movement representing the leftward flank of liberalism during the late 18th and early 19th centuries and a precursor to social liberalism, social democr ...

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

Radical Party (disambiguation) Radical Party may refer to any of a number of political parties professing the progressive-liberal ideology known as Radicalism: Worldwide * Nonviolent Radical Party Transnational and Transparty (1989–present) Europe In the western Mediterra ...

, several political parties * Radicals (UK), a British and Irish grouping in the early to mid-19th century * Radicalization

Ideologies

* Radical chic, a term coined by Tom Wolfe to describe the pretentious adoption of radical causes *

Radical feminism Radical feminism is a perspective within feminism that calls for a radical re-ordering of society in which male supremacy is eliminated in all social and economic contexts, while recognizing that women's experiences are also affected by other ...

, a perspective within feminism that focuses on patriarchy * Radical Islam, or Islamic extremism * Radical veganism, a radical interpretation of veganism, usually combined with anarchism *

Radical Reformation The Radical Reformation represented a response to corruption both in the Catholic Church and in the expanding Magisterial Protestant movement led by Martin Luther and many others. Beginning in Germany and Switzerland in the 16th century, the Ra ...

, 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 Radical surgery, also called radical dissection, is surgery that is more extensive than "conservative" surgery. In surgical oncology, radical surgery is surgery intended to remove both a tumor and any metastases thereof, for diagnostic and/or tr ...

, where diseased tissue or lymph nodes are removed from a diseased organ

Mathematics

Radical expression In mathematics, a radicand, also known as an nth root, of a number ''x'' is a number ''r'' which, when raised to the power ''n'', yields ''x'': :r^n = x, where ''n'' is a positive integer, sometimes called the ''degree'' of the root. A ro ...

involving roots, also known as an ''n''th root * Radical symbol (√), used to indicate the square root and other roots *

Radical of an algebraic group The radical of an algebraic group is the identity component of its maximal normal subgroup, normal solvable group, solvable subgroup. For example, the radical of the general linear group \operatorname_n(K) (for a field ''K'') is the subgroup consist ...

, a concept in algebraic group theory * Radical of an ideal, an important concept in abstract algebra *

Radical of a ring In ring theory, a branch of mathematics, a radical of a ring is an ideal of "not-good" elements of the ring. The first example of a radical was the nilradical introduced by , based on a suggestion of . In the next few years several other radical ...

, 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) A root (or root word) 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. The root word is the prim ...

, 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 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 vowels ...

Arts and entertainment

Music

* ''Radical'' (mixtape), by Odd Future, 2010 * ''Radical'' (Every Time I Die album), 2021 * ''Radical'' (Smack album), 1988 *"Radicals", 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: My Journey out of Islamist Extremism'', by Maajid Nawaz, 2013 * ''Radical'' (book), by David Platt, 2010

Other uses

* Radical, Missouri, U.S., a ghost town *

Radical, North Carolina Radical is an unincorporated area in Wilkes County, North Carolina. History A post office A post office is a public facility and a retailer that provides mail services, such as accepting letters and parcels, providing post office boxes, and ...

, U.S. * Radical Sportscars, a British sports car maker * Radical Entertainment, a Canadian video game developer *

Radical.fm Radical.FM was a digital music streaming service available on iOS devices, Android devices, and desktop web browsers. The service allows users to create their own custom online radio stations based on musical genres. Unlike other streaming service ...

, a digital music streaming service