Meaning of HYPOTHESIS in English

HYPOTHESIS

[noun] [C] [plural] hypotheses - an idea or explanation for something that is based on known facts but has not yet been provedSeveral hypotheses for global warming have been suggested.Dr Elwood said the belief that milk could be harmful was based on the hypothesis that fat causes heart disease. [+ that clause]

Cambridge English vocab.      Кембриджский английский словарь.