Notion
Notion noun - An idea that is believed to be true or valid without positive knowledge.
Usage example: has this naive notion that most people are basically honest
Theory is a synonym for notion in assumption topic. In some cases you can use "Theory" instead a noun "Notion".
Theory
Theory noun - An idea that is the starting point for making a case or conducting an investigation.
Usage example: set out to prove her theory that people can't really taste any difference between colas, so they buy according to the product's image
Mutual synonyms
How words are described
Both words in one sentence
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As for Jacksonville... And with regard to the notion of overpopulation, the idea behind the theory was never that a too-large population would run out of room to live in, but that there wouldn't be enough food for them to eat.
Source: Series / 19 Kids and Counting - Set theory also includes a notion of a bigger set: for example, {1,2,3,4} is a bigger set than {2,3,4}.
Source: Useful Notes / Mathematics - The notion of "warm" and "cool" colors is basic color theory.
Source: Guide Dang It / Adventure
Cite this Source
Theory and Notion. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/notion/theory
Notion & Theory. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/notion/theory>.
Theory or Notion. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/notion/theory.
Google Ngram Viewer shows how "notion" and "theory" have occurred on timeline