American English

Definition of notion noun from the Oxford Advanced American Dictionary



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an idea, a belief, or an understanding of something notion (of something) a political system based on the notions of equality and liberty She had only a vague notion of what might happen. He has no notion of the difficulty of the problem. notion (that…) I have to reject the notion that greed can be a good thing.
See the Oxford Advanced Learner's Dictionary entry: notion