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A frightening-looking symbol (√) that scares off even kids who don't dislike school math.
Radicals do terrify and terrorize kids—shouldn't they be banned at least from elementary math textbooks?
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by MathPlus November 01, 2016
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adj.- a description of an action or thing which is especially impressive.

n.- an extremist of a belief or a rebel
Did you see Tony Hawk pull off the 900? It was a radical move.
by Brendan aka Benj June 05, 2004
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A radical is a person subscribing to a political ideology supporting massive, unmeasured, and rapid change. Radicalism is contrasted with conservatism that advocate minimum change, reactionary action advocating counter-change, as well as progressivism advocating moderate/measured change.
A radical would want to chang, for example, a feudal system into a completely capitalist system, or a completely capitalist system into a communist one. Another exaple of radicalism would be a person who wanted to change an Islamic Theocracy into an Atheist state (see!
by Secular leftist October 21, 2005
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Radical (rahd eek al) is a word used proficiently and often by Michaelangelo of the Teenage Mutant Ninja Turtles. He is the only one on earth that truly knows its awesomeness, although such scholars as William Preston-Esquire and Theordore Theordore Logan have come close to unveiling the true natures of such speak. The best reason for dividing radical is to make more mini-radicals influence from the beinning radical, in hopes of creating a little radical for everyone. And pizza.
by ZtoTheObe April 17, 2011
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another word for cool, awsome, wicked, mad. but of course, Radical is Radicaller than those words
Dude 1: you are radical dude.
Dude 2: thanks dude your radical too.
by MegghanBeCool August 31, 2007
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When something is really cool but you really want to go over board so you say radical
That kickflip was radical dude 😎🤙
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by Mo$t_wanted_$ELLY April 16, 2017
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A word used by people over the age of 30 in an attempt to sound cool, usually resulting in the opposite.
Jim: (to friend) Hey check it out I got a new snowboard.

Jim's mom: (overhearing conversation) Yeah its totally radical.

Jim: OK you can go away now.
by shoop February 17, 2006
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