Radical may refer to: Politics and ideology Politics Radical politics, the political intent of fundamental societal change Radicalism (historical), 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), 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, 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, 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 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", 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