assumption - definition and synonyms

 
 
noun 

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/əˈsʌmpʃ(ə)n/
singularassumption
pluralassumptions
  1. 1
    [countable] something that you consider likely to be true even though no one has told you directly or even though you have no proof

    Your argument is based on a completely false assumption.

    assumption that:

    There is an assumption that all the people who live around here are rich.

    make an assumption (=make a decision based on poor evidence):

    People tend to make assumptions about you based on your appearance.

    on the assumption that:

    The law works on the assumption that it is preferable for children to be with their mother.

  2. 2
    [uncountable] a process in which you begin to use your power or status, or begin to be responsible for something

    the assumption of adult responsibilities