/ haɪˈpɒθəsɪs; NAmE -ˈpɑːθ-/ noun ( pl. hy·poth·eses / -siːz; NAmE /)
1.
[ C ] an idea or explanation of sth that is based on a few known facts but that has not yet been proved to be true or correct
SYN theory :
to formulate / confirm a hypothesis
a hypothesis about the function of dreams
2.
[ U ] guesses and ideas that are not based on certain knowledge
SYN speculation :
It would be pointless to engage in hypothesis before we have the facts.
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WORD ORIGIN
late 16th cent.: via late Latin from Greek hupothesis foundation, from hupo under + thesis placing.