Definition of notion noun from the Oxford Advanced American Dictionary

    

notion

 noun
noun
NAmE//ˈnoʊʃn//
 
 
jump to other results
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