Longman Dictionary of Contemporary English homepage

presupposition

 noun
     
pre‧sup‧po‧si‧tion formal
1 [countable] something that you think is true, although you have no proof [= assumption]
presupposition that
Hick's presupposition is that all religions believe in the same God.
2 [uncountable] when you think something is true even though you have no proof
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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