pre ‧ sup ‧ po ‧ si ‧ tion /ˌpriːsʌpəˈzɪʃ ə n/ BrE AmE noun formal
[ Word Family: verb : ↑ suppose , ↑ presuppose ; noun : ↑ supposition , ↑ presupposition ; adverb : ↑ supposedly ; adjective : ↑ supposed ]
1 . [countable] something that you think is true, although you have no proof SYN 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