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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.
1. something conceived; notion, idea, design, or plan. 2. the description under which someone considers something: her conception of freedom is wrong. 3. (Physiology) the fertilization of an ovum by a sperm in the Fallopian tube followed by implantation in the womb. 4. origin or beginning: from its conception the plan was a failure. 5. the act or power of forming notions; invention.