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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.
Wiktionary (0.00 / 0 votes) Rate this definition: idea (Noun). An abstract archetype of a given thing, compared to which real-life examples are seen as imperfect approximations; pure essence, as opposed to actual examples. idea (Noun). The conception of someone or something as representing a perfect example; an ideal. idea (Noun). The form or shape of something; a quintessential aspect or characteristic. idea (Noun). An image of an object that is formed in the mind or recalled by the memory.