Adjective

(-)

square-shaped

(mathematics) of a polynomial, involving the second power (square) of a variable but no higher powers, as $ax^2\; +\; bx\; +\; c$.

(mathematics) of an equation, of the form $ax^2\; +\; bx\; +\; c\; =\; 0$.

(mathematics) of a function, of the form $y\; =\; ax^2\; +\; bx\; +\; c$.

Adjective

(en adjective)

Favoring fundamental change, or change at the root cause of a matter.

His beliefs are radical .

(botany, not comparable) Pertaining to a root (of a plant).

Pertaining to the basic or intrinsic nature of something.

* Burke

The most determined exertions of that authority, against them, only showed their radical independence.

Thoroughgoing.

* {{quote-magazine, date=2012-01

, author=Donald Worster , title=A Drier and Hotter Future , volume=100, issue=1, page=70 , magazine= citation , passage=Phoenix and Lubbock are both caught in severe drought, and it is going to get much worse. We may see many such [dust] storms in the decades ahead, along with species extinctions, radical disturbance of ecosystems, and intensified social conflict over land and water. Welcome to the Anthropocene, the epoch when humans have become a major geological and climatic force.}}

The spread of the cancer required radical surgery, and the entire organ was removed.

(linguistics, not comparable) Of or pertaining to the root of a word.

(linguistics, not comparable, of a sound) Produced using the root of the tongue.

(chemistry, not comparable) Involving free radicals.

(math) Relating to a radix or mathematical root.

a radical''' quantity; a '''radical sign

Excellent; awesome.

That was a radical jump!