Meaning of “notion” in the English Dictionary

"notion" in British English

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notionnoun [ C or U ]

uk /ˈnəʊ.ʃən/ us /ˈnoʊ.ʃən/

C1 a belief or idea:

[ + that ] The show's director rejects the notion that seeing violence on television has a harmful effect on children.
I have only a vague notion of what she does for a living.

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(Definition of “notion” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"notion" in American English

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notionnoun [ C ]

us /ˈnoʊ·ʃən/

a belief or idea:

Nast helped form the American notion of Santa Claus.

(Definition of “notion” from the Cambridge Academic Content Dictionary © Cambridge University Press)