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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.
Notional amount. The notional amount (or notional principal amount or notional value) on a financial instrument is the nominal or face amount that is used to calculate payments made on that instrument. This amount generally does not change and is thus referred to as notional.