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pre‧sump‧tion

1 [countable] something that you think is true because it is very likely
On the presumption that the doctor knows best, I took the medicine.
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
3 [uncountable] formal behaviour that seems rude and too confident :
She was enraged by his presumption.
She was enraged by his presumption.