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The definition of radical

13 Definitions of: radical

1. adjective, of, relating to, or characteristic of the basic or inherent constitution of a person or thing; fundamental
2. adjective, concerned with or tending to concentrate on fundamental aspects of a matter; searching or thoroughgoing
3. adjective, favouring or tending to produce extreme or fundamental changes in political, economic, or social conditions, institutions, habits of mind, etc
4. adjective, med (of treatment) aimed at removing the source of a disease
5. adjective, slang very good; excellent
6. adjective, of, relating to, or arising from the root or the base of the stem of a plant
7. adjective, maths of, relating to, or containing roots of numbers or quantities
8. adjective, linguistics of or relating to the root of a word
9. noun, a person who favours extreme or fundamental change in existing institutions or in political, social, or economic conditions
10. noun, maths a root of a number or quantity, such as ³√5, √x
11. noun, Also: radicle chem a)short for free radical b)another name for group
12. noun, linguistics. another word for root
13. noun, (in logographic writing systems such as that used for Chinese) a part of a character conveying lexical meaning
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1. noun, the monovalent group --COOH, consisting of a carbonyl group bound to a hydroxyl group: the functional group in organic acids
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1. noun, chem the divalent group, -CH₂CH₂-, derived from ethylene
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Synonyms:	organic, extreme, extremist, revolutionary, militant, fanatic, complete, entire, sweeping, violent	And more...
Antonyms:	conservative, superficial

From Collins