Definition of presupposition noun from the Oxford Advanced American Dictionary

     

    presupposition

     noun
    noun
    NAmE//ˌpriˌsʌpəˈzɪʃn//
     
    [countable, uncountable](formal)
     
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  1. 1something 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
  2. 2 theories based on presupposition and coincidence
See the Oxford Advanced Learner's Dictionary entry: presupposition