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assumption

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noun British English pronunciation: assumption /əˈsʌmpʃ(ə)n/ 
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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.

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