Definition of presupposition noun from the Oxford Advanced Learner's Dictionary

 

presupposition

 noun
noun
BrE BrE//ˌpriːsʌpəˈzɪʃn//
 
; NAmE NAmE//ˌpriːsʌpəˈzɪʃn//
 
[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 Word Origin mid 16th cent.: from medieval Latin praesuppositio(n-), from the verb praesupponere, from prae ‘before’ + supponere ‘place under’ (from sub- ‘from below’ + ponere ‘to place’).Extra examples These theories are based on presupposition and guesswork. Try to clear your mind of any presuppositions. Your presuppositions are quite wrong.
See the Oxford Advanced American Dictionary entry: presupposition