Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Latin
Origin: notio, from notus; NOTICE2

notion

 noun
     
no‧tion W3 [countable]
1 an idea, belief, or opinion
notion of
misguided notions of male superiority
The traditional notion of marriage goes back thousands of years.
She had only a vague notion of what she wanted to do.
notion that
the notion that human beings are basically good
She had no notion what he meant.
accept/challenge/reject etc a notion
They reject the notion of group guilt.
2

notions

[plural] American EnglishDLH small things such as thread and buttons that are used for sewing
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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