RADICAL | English Meaning, Definition, and Pronunciation

late Middle English (in the senses ‘forming the root’ and ‘inherent’): from late Latin radicalis, from Latin radix, radic- ‘root’

(especially of change or action) relating to or affecting the fundamental nature of something; far-reaching or thorough

relating to or affecting fundamental nature of something

• a radical overhaul of the existing regulatory framework

advocating or based on thorough or complete political or social change; representing or supporting an extreme or progressive section of a political party

advocating or based on thorough or complete political or social change

• a radical activist

denoting or relating to the roots of a word.

denoting or relating to roots of word

relating to or forming the root of a number or quantity.

of root of number or quantity

of, or springing direct from, the root or stem base of a plant.

of, or springing direct from, root or stem base of plant

very good; excellent

very good

• Okay, then. Seven o'clock. Radical!

a person who advocates thorough or complete political or social change, or a member of a political party or section of a party pursuing such aims.

person who advocates thorough or complete political or social reform

a group of atoms behaving as a unit in a number of compounds.

group of atoms behaving as unit in several compounds

the root or base form of a word.

root or base form of word

a quantity forming or expressed as the root of another.

quantity forming or expressed as root of another