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

      

    assumption

     noun
    noun
    BrE BrE//əˈsʌmpʃn//
     
    ; NAmE NAmE//əˈsʌmpʃn//
     
     
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  1. 1[countable] a belief or feeling that something is true or that something will happen, although there is no proof an underlying/implicit assumption We need to challenge some of the basic assumptions of Western philosophy. We are working on the assumption that everyone invited will turn up. It was impossible to make assumptions about people's reactions. His actions were based on a false assumption. She arrived at college with a whole set of assumptions inherited from her family.
  2. 2[countable, uncountable] assumption of something (formal) the act of taking or beginning to have power or responsibility their assumption of power/control the assumption of responsibility by the government for the disaster
  3. Word Origin Middle English: from Old French asompsion or Latin assumptio(n-), from the verb assumere, from ad- ‘towards’ + sumere ‘take’.Extra examples Lots of evidence supports this assumption. She’s always making assumptions about how much money people have. There is an underlying assumption that the unemployed are reluctant to work. We are working on the assumption that the techniques are safe. Your argument is based on a set of questionable assumptions. assumptions about how women should behave shared assumptions between teachers and parents the assumptions underlying their beliefs I really don’t like you making assumptions about what I think. The underlying assumption is that young people are incapable of knowing their own minds. There is a general but false assumption that intelligent people do better in life. They are basing their costs on the assumption that about 10 000 people will need to be rehoused. We are working on the assumption that about 50 people will turn up. We need to establish a basic set of assumptions before we can continue.
See the Oxford Advanced American Dictionary entry: assumption