Longman Dictionary of Contemporary English homepage

presumption

noun
     
pre‧sump‧tion
1 [countable] something that you think is true because it is very likely
presumption that
the presumption that their wealth is the result of crime
On the presumption that the doctor knows best, I took the medicine.
2 [uncountable and countable] law the act of thinking something is true, bad, or good until it is shown to not be true, bad, or good
presumption of
the presumption of innocence
presumption against/in favour of
a strong presumption against development in national parks
3 [uncountable] formal behaviour that seems rude and too confident:
She was enraged by his presumption.

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