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Notion may refer to:
- Notion (ancient city), a Greek city-state on the west coast of Anatolia
- Notion (philosophy), a reflection in the mind of real objects and phenomena in their essential features and relations
- Notions (sewing), small articles used in sewing and haberdashery
- Notion (software), music composition and performance computer program
- "Notion" (song), a 2008 song by Kings of Leon
- Notions (Winchester College), the Winchester slang
- Notions, the rules of conduct among Russian prison inmates in the old Soviet Union
disambiguation page lists articles associated with the title Notion.
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