Radical

noun

(historical: 19th-century Britain) A member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short of socialism).
(historical: early 20th-century France) A member of an influential, centrist political party favouring moderate social reform, a republican constitution, and secular politics.
A person with radical opinions.
A root (of a number or quantity).
In logographic writing systems such as the Chinese writing system, the portion of a character (if any) that provides an indication of its meaning, as opposed to phonetic.
In Semitic languages, any one of the set of consonants (typically three) that make up a root.
A group of atoms, joined by covalent bonds, that take part in reactions as a single unit.
A free radical.
(commutative algebra, of an ideal) Given an ideal I in a commutative ring R, another ideal, denoted Rad(I) or \sqrt{I}, such that an element x ∈ R is in Rad(I) if, for some positive integer n, xn ∈ I; equivalently, the intersection of all prime ideals containing I.
(of a ring) Given a ring R, an ideal containing elements of R that share a property considered, in some sense, "not good".
(of a module) The intersection of maximal submodules of a given module.
The product of the distinct prime factors of a given positive integer.

adjective

Favoring fundamental change, or change at the root cause of a matter.
His beliefs are radical.
Pertaining to a root (of a plant).
Pertaining to the basic or intrinsic nature of something.
Thoroughgoing; far-reaching.
The spread of the cancer required radical surgery, and the entire organ was removed.
Of or pertaining to the root of a word.
(of a sound) Produced using the root of the tongue.
Involving free radicals.
Relating to a radix or mathematical root.
a radical quantity; a radical sign
(1980s & 1990s) Excellent; awesome.
That was a radical jump!

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