Definition of “notion” - 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.

More examples

  • He has some fanciful notion about converting one room of his apartment into a gallery.
  • I don't think he has any notion of the seriousness of the situation.
  • Dave's got some strange notion that you're only respectable if you own a piece of property.
  • You must judge each film on its own merits, without any preconceived notions about what it's like.
  • Whatever gave you that notion?

(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)