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LINK / CITE ADD TO WORD LIST. noun. The definition of a notion is an idea, belief or vague knowledge of something. 1  An example of a notion is when you have an idea of what acceptable behavior is. 2  An example of a notion is when you sort of remember hearing about a particular fact.INK / CITE ADD TO WORD LIST. noun. The definition of a notion is an idea, belief or vague knowledge of something. 1  An example of a notion is when you have an idea of what acceptable behavior is. 2  An example of a notion is when you sort of remember hearing about a particular fact.
2. a general inclusive concept. 3. an odd or fanciful or capricious idea. 4. (usually plural) small personal articles or clothing or sewing items. Familiarity information: NOTION used as a noun is uncommon.eaning: A vague idea in which some confidence is placed. Classified under: Nouns denoting cognitive processes and contents. Synonyms: notion; impression; feeling; belief; opinion.