Assumption
Assumption noun - Something taken as being true or factual and used as a starting point for a course of action or reasoning.
Usage example: your argument is faulty because it's based on erroneous assumptions
Supposition is a synonym for assumption in conjecture topic. In some cases you can use "Supposition" instead a noun "Assumption", when it comes to topics like anticipation, reason, hypothesis, presumption. popular alternative
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
Assumption is a synonym for supposition in conjecture topic. You can use "Assumption" instead a noun "Supposition", if it concerns topics such as anticipation, belief, reason, guess. popular alternative
Mutual synonyms
Related pairs
- inference and assumption
- inference and supposition
- belief and assumption
- belief and supposition
- surmise and assumption
- surmise and supposition
- notion and assumption
- notion and supposition
- opinion and assumption
- opinion and supposition
- expectation and assumption
- expectation and supposition
- idea and assumption
- idea and supposition
How words are described
| rational | rational assumption | rational supposition |
| common | common assumption | common supposition |
| valid | valid assumption | valid supposition |
| unreasonable | unreasonable assumption | unreasonable supposition |
Cite this Source
Supposition and Assumption. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/assumption/supposition
Assumption & Supposition. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/assumption/supposition>.
Supposition or Assumption. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/assumption/supposition.
Google Ngram Viewer shows how "assumption" and "supposition" have occurred on timeline