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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.
notion-a general inclusive concept. concept, conception, construct-an abstract or general idea inferred or derived from specific instances. mumpsimus-a traditional notion that is obstinately held although it is unreasonable; he still holds to the old mumpsimus that a woman's place is in the kitchen.otion. 1. Something believed or accepted as true by a person: belief, conviction, feeling, idea, mind, opinion, persuasion, position, sentiment, view. 2.