"Radical" can have different meanings depending on the context:
1. **Adjective**: It can mean relating to or affecting the fundamental nature of something; far-reaching or thorough. For example, a "radical change" would be a significant and transformative alteration.
2. **Noun**: In politics, it refers to a person who advocates thorough or complete political or social reform; a member of a radical political group.
To use it in a sentence:
- *Adjective*: "The company implemented radical changes to its business model, resulting in increased efficiency and profitability."
- *Noun*: "She was known as a radical for her outspoken views on social justice and equality."
So, you can use "radical" to describe a drastic change or a person advocating for extreme reform.
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