Supposition
Supposition noun - An idea that is the starting point for making a case or conducting an investigation.
Usage example: my supposition is that this grape variety, which flourishes in southern France, should do equally well here, given the similar climate
Theory is a synonym for supposition in belief topic. In some cases you can use "Theory" instead a noun "Supposition", when it comes to topics like idea, conjecture, reason, guess. popular alternative
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
Supposition is a synonym for theory in hypothesis topic. You can use "Supposition" instead a noun "Theory", if it concerns topics such as idea, conjecture, reason. popular alternative
Mutual synonyms
Related pairs
How words are described
Both words in one sentence
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There's an elaborate fan theory as to why this is, involving the supposition that the DeLorean's time circuit is being used at another point in time (preventing the one in the "now" from working), but it could also just be Plot Driven Phlebotinum Breakdown.
Source: My Car Hates Me
Cite this Source
Theory and Supposition. (2016). Retrieved 2026, July 20, from https://thesaurus.plus/related/supposition/theory
Supposition & Theory. N.p., 2016. Web. 20 Jul. 2026. <https://thesaurus.plus/related/supposition/theory>.
Theory or Supposition. 2016. Accessed July 20, 2026. https://thesaurus.plus/related/supposition/theory.
Google Ngram Viewer shows how "supposition" and "theory" have occurred on timeline