Definitions of Radical [ˈræd ɪ kəl]

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Definition of 'Radical'

Random House Webster's College Dictionary

1. (adj.) radical
of or going to the root or origin; fundamental.

2.  radical
thoroughgoing or extreme:
a radical change in company policy.

3.  radical
favoring drastic political, economic, or social reforms.

4.  radical
existing inherently in a thing or person:
radical defects of character.

5.  radical
Math.

6.  radical
pertaining to or forming a root.

7.  radical
denoting or pertaining to the radical sign.

8.  radical
of or pertaining to the root of a word.

9.  radical
Bot. of or arising from the root or the base of the stem.

10.  radical
Slang. great; marvelous; wonderful.

11. (n.) radical
a person who holds or follows strong convictions or extreme principles; extremist.

12.  radical
a person who advocates fundamental political, economic, and social reforms by direct and often uncompromising methods.

13.  radical
Math.

14.  radical
a quantity expressed as a root of another quantity.

15.  radical
Chem.

Etymology: (1350–1400; ME < LL rādīcālis having roots < L rādīc- (s. of rādīx) root¹)

Definition of 'Radical'

Princeton's WordNet

1. (noun) group, radical, chemical group
(chemistry) two or more atoms bound together as a single unit and forming part of a molecule

2. (noun) free radical, radical
an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule
"in the body free radicals are high-energy particles that ricochet wildly and damage cells"

3. (noun) radical
a person who has radical ideas or opinions

4. (noun) radical
(mathematics) a quantity expressed as the root of another quantity

5. (noun) radical
a character conveying the lexical meaning of a logogram

6. (adj) root, root word, base, stem, theme, radical
(linguistics) the form of a word after all affixes are removed
"thematic vowels are part of the stem"

7. (adj) extremist, radical, ultra
(used of opinions and actions) far beyond the norm
"extremist political views"; "radical opinions on education"; "an ultra conservative"

8. (adj) revolutionary, radical
markedly new or introducing radical change
"a revolutionary discovery"; "radical political views"

9. (adj) radical
arising from or going to the root or source
"a radical flaw in the plan"

10. (adj) radical
of or relating to or constituting a linguistic root
"a radical verb form"

11. (adj) radical, basal
especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem
"basal placentation"; "radical leaves"

Definition of 'Radical'

Kernerman English Learner’s Dictionary

1. (adjective) radical
extreme
radical political beliefs

2. radical
major or very great
radical changes

Definition of 'Radical'

Webster Dictionary

1. (adj) Radical
of or pertaining to the root; proceeding directly from the root

2. (adj) Radical
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

3. (adj) Radical
belonging to, or proceeding from, the root of a plant; as, radical tubers or hairs

4. (adj) Radical
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

5. (adj) Radical
relating, or belonging, to the root, or ultimate source of derivation; as, a radical verbal form

6. (adj) Radical
of or pertaining to a radix or root; as, a radical quantity; a radical sign. See below

7. (adj) Radical
a radical vessel. See under Radical, a

8. (noun) Radical
a primitive word; a radix, root, or simple, underived, uncompounded word; an etymon

9. (noun) Radical
a primitive letter; a letter that belongs to the radix

10. (noun) Radical
one who advocates radical changes in government or social institutions, especially such changes as are intended to level class inequalities; -- opposed to conservative

11. (noun) Radical
a characteristic, essential, and fundamental constituent of any compound; hence, sometimes, an atom

12. (noun) Radical
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

13. (noun) Radical
a radical quantity. See under Radical, a

Translation of 'Radical'

Kernerman English Multilingual Dictionary

Sense: relating to the basic nature of something radical faults in the design.
Afrikaans: wesenlik	Arabic: أساسي	Bulgarian: коренен
Brazilian: radical	Czech: základní	German: fundamental
Danish: grundlæggende	Greek: ριζικός, βασικός	Spanish: radical, fundamental
Estonian: põhimõtteline	Farsi: اصلی	Finnish: perinpohjainen
French: fondamental	Hebrew: יְסוֹדִי	Hindi: आधारिक
Croatian: radikalan, temeljan	Hungarian: gyökeres	Indonesian: mendasar
Icelandic: grundvallar-	Italian: radicale	Japanese: 根本的な
Korean: 근원적인	Lithuanian: esminis	Latvian: būtisks
Malay: radikal	Dutch: radiator	Norwegian: grunnleggende
Polish: podstawowy, zasadniczy	Persian: اصلی	Pashto: اساسى، بنيادى، دراډيكال ګ
Portuguese: radical	Romanian: esenţial	Russian: коренной
Slovak: základný	Slovenian: bistven	Serbian: radikalan
Swedish: grundläggande, fundamenta	Thai: โดยรากฐาน	Turkish: temel, asıl
Taiwanese: 根本的	Ukrainian: корінний; основний	Urdu: بنیادی
Vietnamese: cơ bản	Chinese: 基本的
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