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English definition of “supposition”

supposition

noun [C]  /ˌsʌp·əˈzɪʃ·ən/ fml us  
an idea that something may be true, although it is not certain: [+ that clause] The investment was based on the supposition that there was adequate demand for a new modern office building.
(Definition of supposition from the Cambridge Academic Content Dictionary © Cambridge University Press)
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