Definition of supposition noun from the Oxford Advanced Learner's Dictionary

     

    supposition

     noun
    noun
    BrE BrE//ˌsʌpəˈzɪʃn//
     
    ; NAmE NAmE//ˌsʌpəˈzɪʃn//
     
    (formal)
     
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  1. 1[countable] supposition (that…) an idea that you think is true although you may not be able to prove it synonym assumption The police are working on the supposition that he was murdered. All the evidence appears to support this supposition. It seems a reasonable supposition.
  2. 2[uncountable] the act of believing or claiming that something is true even though it cannot be proved The report is based entirely on supposition. What happened next is a matter of supposition.
  3. Word 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, from sub- ‘from below’ + ponere ‘to place’.Extra examples Let’s work on the supposition that she meant no offence. She was charged on the supposition that she had colluded with her husband in the murders. That is mere supposition! They are making all sorts of suppositions about our possible reaction. We can make a supposition about how the accident happened. You are correct in your suppositions about the source of his wealth. a supposition of innocence There have been some interesting suppositions about the causes of the disease.
See the Oxford Advanced American Dictionary entry: supposition