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!

Adjective

(en-adj)

With all parts included; with nothing missing; full.

* {{quote-magazine, year=2012, month=March-April

, author= , title=Well-connected Brains , volume=100, issue=2, page=171 , magazine=(American Scientist) citation , passage=Creating a complete map of the human connectome would therefore be a monumental milestone but not the end of the journey to understanding how our brains work.}}

Finished; ended; concluded; completed.

*

, title=(The Celebrity), chapter=5 , passage=In the eyes of Mr. Farquhar Fenelon Cooke the apotheosis of the Celebrity was complete . The people of Asquith were not only willing to attend the house-warming, but had been worked up to the pitch of eagerness. The Celebrity as a matter of course was master of ceremonies.}}

(Generic intensifier).

(analysis, Of a metric space) in which every Cauchy sequence converges.

(algebra, Of a lattice) in which every set with a lower bound has a greatest lower bound.

(math, Of a category) in which all small limits exist.

(logic, of a proof system of a formal system)   With respect to a given semantics, that any well-formed formula which is (semantically) valid must also be provable.Sainsbury, Mark [2001] Logical Forms : An Introduction to Philosophical Logic . Blackwell Publishing, Hong Kong (2010), p. 358.

* Gödel's first incompleteness theorem showed that Principia'' could not be both consistent and complete. According to the theorem, for every sufficiently powerful logical system (such as ''Principia''), there exists a statement ''G'' that essentially reads, "The statement ''G'' cannot be proved." Such a statement is a sort of Catch-22: if ''G'' is provable, then it is false, and the system is therefore inconsistent; and if ''G is not provable, then it is true, and the system is therefore incomplete.^(w)