presumption

/prɪˈzʌmpʃən/
noun
  1. A belief that something is true based on reasonable evidence or probability.
    • Based on the dark clouds, the presumption is that it will rain soon.
    • There is a strong presumption that the missing hiker is still alive.
    • The legal system operates on the presumption of innocence until proven guilty.
  2. Behavior that is too confident or bold, often in a way that is rude or disrespectful.
    • It was sheer presumption for him to invite himself to the private dinner.
    • Her presumption in correcting the teacher embarrassed everyone in class.
    • He had the presumption to ask for a raise after only one week on the job.
  3. An idea or assumption that is taken for granted without proof.
    • The whole plan is based on the presumption that funding will be approved.
    • His argument rests on a false presumption about human nature.
    • Don't make the presumption that everyone agrees with your opinion.