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Definition of presupposition noun from the Oxford Advanced American Dictionary

 

presupposition

 noun
noun
NAmE//ˌpriˌsʌpəˈzɪʃn//
 
[countable, uncountable] (formal)
 
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something that you believe to be true and use as the beginning of an argument even though it has not been proved; the act of believing it is true synonym assumption theories based on presupposition and coincidence
See presupposition in the Oxford Advanced Learner's Dictionary