Definition of presumption noun from the Oxford Advanced American Dictionary

      

    presumption

     noun
    noun
    NAmE//prɪˈzʌmpʃn//
     
     
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  1. 1 [countable] something that people think is probably true There is a general presumption that the doctor knows best.
  2. 2[uncountable] (formal) behavior that is too confident and shows a lack of respect for other people She was infuriated by his presumption in not consulting her first.
  3. 3[uncountable, countable] (law) the act of supposing that something is true, although it has not yet been proved or is not certain Everyone is entitled to the presumption of innocence until they are proven to be guilty.
See the Oxford Advanced Learner's Dictionary entry: presumption