supposition

 
Pronunciation: /ˌsʌpəˈzɪʃ(ə)n/

noun

  • a belief held without proof or certain knowledge; an assumption or hypothesis: they were working on the supposition that his death was murder [mass noun]: their outrage was based on supposition and hearsay

Derivatives

suppositional

adjective

Origin:

late Middle English (as a term in scholastic logic): from Old French, or from late Latin suppositio(n-) (translating Greek hupothesis 'hypothesis'), from the verb supponere (see suppose)