A Quick and Simple Dictionary

radical

1. Adjective.  Favouring fundamental change, or change at the root cause of a matter.
2. Adjective.  (context, botany) Of or pertaining to a root (italbrac, of a plant) .
3. Adjective.  Of or pertaining to the intrinsic nature of something.
4. Adjective.  Thoroughgoing.
5. Adjective.  (context, linguistics) Of or pertaining to the root of a word.
6. Adjective.  (context, chemistry) Involving free radicals.
7. Adjective.  (slang) Excellent.
8. Noun.  (context, historical: 19th-century England) A member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short of socialism).
9. Noun.  (context, historical: early 20th-century France) A member of an influential, centrist political party favouring moderate social reform, a republican constitution, and secular politics.
10. Noun.  A person with radical opinions.
11. Noun.  (context, arithmetic) A root (of a number or quantity).
12. Noun.  (context, linguistics) In logographic writing systems as the Chinese writing system, the portion of a character (if any) that provides an indication of its meaning, as opposed to '''phonetic'''.
13. Noun.  (context, linguistics) In Semitic languages, any one of the set of consonants (typically three) that make up a root.
14. Noun.  (context, chemistry) A group of atoms, joined by covalent bonds, that take part in reactions as a single unit.
15. Noun.  (context, organic chemistry) A free radical.