/ ˈnəʊʃn; NAmE ˈnoʊʃn/ noun
notion (that ... ) | notion (of sth) an idea, a belief or an understanding of sth :
a political system based on the notions of equality and liberty
I have to reject the notion that greed can be a good thing.
She had only a vague notion of what might happen.
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WORD ORIGIN
late Middle English : from Latin notio(n-) idea, from notus known, past participle of noscere .