Radical is part of the Academic Word List. It is important for students in college and university.

## Contents

### Pronunciation

1. A radical change, difference, etc. is very big and important; from the roots.
The plan will not be easy and requires a radical change in the culture of the city.
Many voices are calling for a more radical move away from the current situation.
2. A radial idea, policy, etc. is one that is new and different; not standard.
More radical organisations like Greenpeace and Friends of the Earth have brought attention to these issues.
In a totalitarian society there is no more radical emotion than disbelief.
3. (technical) Of or about a root (e.g., ${\displaystyle {\sqrt {4}}=2}$, the roots of plants, the root of a word, etc.)
4. cool

## Noun

1. (countable) A radical is a person whose views are very different from most people.
2. (countable) (mathematics) A quantity expressed as a root of another quantity. (e.g., ${\displaystyle {\sqrt {4}}}$)