/
hʌɪˈpɒθɪsɪs/
n.
 (pl. hypotheses  
/-siːz/
)
 a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation. 
▸Philosophy  a proposition made as a basis for reasoning.
Derivative
- hypothesize
 or hypothesise v.
Etymology
C16: via late L. from Gk hupothesis ‘foundation’.