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Definitions for Radical

[1] of or going to the root or origin; fundamental: a radical difference.
[2] thoroughgoing or extreme, especially as regards change from accepted or traditional forms: a radical change in the policy of a company.
[3] favoring drastic political, economic, or social reforms: radical ideas; radical and anarchistic ideologues.
[4] favoring, supporting, or representing extreme forms of religious fundamentalism: radical fundamentalists and their rejection of modern science.
[5] forming a basis or foundation: What is the radical reason for his choice?
[6] existing inherently in a thing or person: radical defects of character.
[7] Mathematics . pertaining to or forming a root. denoting or pertaining to the radical sign. irrational(def 5b) .
[8] Grammar . of or pertaining to the root of a word.
[9] Botany . of or arising from the root or the base of the stem.
[10] a person who holds or follows strong convictions or extreme principles; extremist.
[11] a person who advocates fundamental political, economic, and social reforms by direct and often uncompromising methods.
[12] Mathematics . a quantity expressed as a root of another quantity. the set of elements of a ring, some power of which is contained in a given ideal. radical sign.
[13] Chemistry . group(def 3) . free radical.
[14] Grammar . root1(def 12) .
[15] (in Chinese writing) one of 214 ideographic elements used in combination with phonetics to form thousands of different characters.
[16] of, relating to, or characteristic of the basic or inherent constitution of a person or thing; fundamental a radical fault
[17] concerned with or tending to concentrate on fundamental aspects of a matter; searching or thoroughgoing radical thought ; a radical re-examination
[18] favouring or tending to produce extreme or fundamental changes in political, economic, or social conditions, institutions, habits of mind, etc a radical party
[19] med (of treatment) aimed at removing the source of a disease radical surgery
[20] slang , mainly US very good; excellent
[21] of, relating to, or arising from the root or the base of the stem of a plant radical leaves
[22] maths of, relating to, or containing roots of numbers or quantities
[23] linguistics of or relating to the root of a word
[24] a person who favours extreme or fundamental change in existing institutions or in political, social, or economic conditions
[25] maths a root of a number or quantity, such as ³√5, √ x
[26] Also: radicle chem short for free radical another name for group (def. 10)
[27] linguistics another word for root 1 (def. 9)
[28] (in logographic writing systems such as that used for Chinese) a part of a character conveying lexical meaning

Words related to Radical

profound, revolutionary, militant, fanatical, progressive, uncompromising, far-out, extremist, violent, sweeping, leftist, renegade, fanatic, firebrand, insurgent, agitator, rebel, subversive, anarchist, reformer

Words nearby Radical

radiative capture, radiative zone, radiator, radiator grille, radiatus, radical, radical axis, radical chic, radical empiricism, radical expression, radical hysterectomy

Origin of Radical

1350–1400; Middle English < Late Latin rādīcālis “having roots,” equivalent to Latin rādīc- (stem of rādīx ) root1 + -ālis -al1

Other words from Radical

rad·i·cal·ness , noun
mul·ti·rad·i·cal , adjective
non·rad·i·cal , adjective, noun
qua·si-rad·i·cal , adjective
sem·i·rad·i·cal , adjective
sub·rad·i·cal , adjective
su·per·rad·i·cal , adjective
ul·tra·rad·i·cal , adjective, noun
un·rad·i·cal , adjective

Word origin for Radical

C14: from Late Latin rādīcālis having roots, from Latin rādix a root

Synonyms for Radical

profound, basal, bottom, cardinal, constitutional, essential, native, natural, organic, original, primary, primitive, deep-seated, foundational, inherent, innate, intrinsic, meat-and-potatoes, primal, thoroughgoing, underlying, vital