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
Speculation is a synonym for supposition in belief topic. In some cases you can use "Speculation" instead a noun "Supposition", when it comes to topics like opinion, conjecture, assumption, guess. popular alternative
Speculation
Speculation noun - A message expressing an opinion based on incomplete evidence.
Supposition is a synonym for speculation in theory topic. You can use "Supposition" instead a noun "Speculation", if it concerns topics such as conjecture, opinion, assumption, hypothesis. popular alternative
Mutual synonyms
Related pairs
- hunch and supposition
- hunch and speculation
- inference and supposition
- inference and speculation
- belief and supposition
- belief and speculation
- surmise and supposition
- surmise and speculation
- notion and supposition
- notion and speculation
- opinion and supposition
- opinion and speculation
- thought and supposition
- thought and speculation
How words are described
| common | common supposition | common speculation |
| real | real supposition | real speculation |
| off-the-wall | off-the-wall supposition | off-the-wall speculation |
Cite this Source
Speculation and Supposition. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/supposition/speculation
Supposition & Speculation. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/supposition/speculation>.
Speculation or Supposition. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/supposition/speculation.
Google Ngram Viewer shows how "supposition" and "speculation" have occurred on timeline