radical - meaning and definition. What is radical
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What (who) is radical - definition

WIKIMEDIA DISAMBIGUATION PAGE
Radicalist; Radicals; Radicalism; Radical (mathematics); The Radicals; Radical (disambiguation); Radically; Raddest; The Radicals (disambiguation); Radical (album); Radicalism (disambiguation); Radicality

radical         
(radicals)
Frequency: The word is one of the 1500 most common words in English.
1.
Radical changes and differences are very important and great in degree.
The country needs a period of calm without more surges of radical change...
The Football League has announced its proposals for a radical reform of the way football is run in England.
= fundamental
ADJ: usu ADJ n
radically
...two large groups of people with radically different beliefs and cultures.
= fundamentally
ADV
2.
Radical people believe that there should be great changes in society and try to bring about these changes.
...threats by left-wing radical groups to disrupt the proceedings.
? conservative
ADJ: usu ADJ n
A radical is someone who has radical views.
N-COUNT
Radical         
·adj A radical vessel. ·see under Radical, ·adj.
II. Radical ·noun A radical quantity. ·see under Radical, ·adj.
III. Radical ·noun A primitive letter; a letter that belongs to the radix.
IV. Radical ·adj Of or pertaining to the root; proceeding directly from the root.
V. Radical ·adj Belonging to, or proceeding from, the root of a plant; as, radical tubers or hairs.
VI. Radical ·adj Relating, or belonging, to the root, or ultimate source of derivation; as, a radical verbal form.
VII. Radical ·noun A primitive word; a radix, root, or simple, underived, uncompounded word; an Etymon.
VIII. Radical ·adj Of or pertaining to a radix or root; as, a radical quantity; a radical sign. ·see Below.
IX. Radical ·noun A characteristic, essential, and fundamental constituent of any compound; hence, sometimes, an Atom.
X. Radical ·adj Proceeding from a rootlike stem, or one which does not rise above the ground; as, the radical leaves of the dandelion and the sidesaddle flower.
XI. Radical ·noun One who advocates radical changes in government or social institutions, especially such changes as are intended to level class inequalities;
- opposed to conservative.
XII. Radical ·adj Hence: Of or pertaining to the root or origin; reaching to the center, to the foundation, to the ultimate sources, to the principles, or the like; original; fundamental; thorough-going; unsparing; extreme; as, radical evils; radical reform; a radical party.
XIII. Radical ·noun Specifically, a group of two or more atoms, not completely saturated, which are so linked that their union implies certain properties, and are conveniently regarded as playing the part of a single atom; a residue;
- called also a compound radical. ·cf. Residue.
radical         
¦ adjective
1. relating to or affecting the fundamental nature of something.
innovative or progressive.
2. (of surgery) thorough and intended to be completely curative.
3. advocating thorough political or social reform; politically extreme.
Brit. historical belonging to an extreme section of the Liberal party in the 19th century.
4. Mathematics of the root of a number or quantity.
5. denoting or relating to the roots of a word.
6. Music belonging to the root of a chord.
7. Botany of or coming from the root or stem base of a plant.
8. N. Amer. informal excellent.
¦ noun
1. an advocate of radical political or social reform.
2. Chemistry a group of atoms behaving as a unit in a number of compounds. See also free radical.
3. the root or base form of a word.
any of the basic set of Chinese characters constituting semantically or functionally significant elements in the composition of other characters.
4. Mathematics a quantity forming or expressed as the root of another.
Derivatives
radicalism noun
radicalization or radicalisation noun
radicalize or radicalise verb
radically adverb
radicalness noun
Origin
ME: from late L. radicalis, from L. radix, radic- 'root'.

Wikipedia

Radical
Examples of use of radical
1. That‘s why I moved on from my radical liberal upbringing and became an equally radical socialist.
2. None of this is radical, in the grand scheme of feminist thought, but it is all radical now – even not being on a diet is radical now.
3. He is no man of the left, radical or true reformer, but then these are not radical times.
4. Eddok compared it to radical political movements.
5. Their approach was politically and aesthetically radical.