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English definition of “supposition”

supposition

noun [C or U]     /ˌsʌp.əˈzɪʃ.ən/
the fact of believing something is true without any proof or something that you believe to be true without any proof: That article was based on pure supposition.Guesses and assumptions
(Definition of supposition noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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