(especially of change or action) relating to or affecting the fundamental nature of something; far-reaching or thorough
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
a radical activist
denoting or relating to the roots of a word
relating to or forming the root of a number or quantity
of, or springing direct from, the root or stem base of a plant
very good; excellent
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
a group of atoms behaving as a unit in a number of compounds
the root or base form of a word
a quantity forming or expressed as the root of another