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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.
Freebase(3.50 / 2 votes)Rate this definition: In metaphysics, and especially ontology, a concept is a fundamental category of existence. In contemporary philosophy, there are at least three prevailing ways to understand what a concept is: âConcepts as mental representations, where concepts are entities that exist in the brain.