assumption
The French word 'supposition' is similar in usage to the English word 'assumption'. It can be used when you think something is true, although you have no definite proof. However, while 'assumption' in English can sometimes imply a lack of necessary thought or investigation, 'supposition' often carries a slightly more analytical connotation.
It's just a guess, but I think it might rain tomorrow.
In this sentence, 'supposition' is used to express a conjecture or hypothesis about future weather conditions.
Based on the assumption that we are both right.
This usage of 'supposition' indicates a presumption or a presupposition, where it's assumed that both individuals are correct.
The guess is that they are arriving late because of the traffic.
Here, 'supposition' is used to suggest an expectation that someone's lateness is due to traffic.