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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-an odd or fanciful or capricious idea; the theatrical notion of disguise is associated with disaster in his stories; he had a whimsy about flying to the moon; whimsy can be humorous to someone with time to enjoy it.otion. 1. Something believed or accepted as true by a person: belief, conviction, feeling, idea, mind, opinion, persuasion, position, sentiment, view. 2.