presumption
US /prɪˈzʌmp.ʃən/
UK /prɪˈzʌmp.ʃən/
1.
an idea that is taken to be true, and often used as the basis for action or reasoning, without proof
:
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Under the presumption of innocence, a person is considered innocent until proven guilty.
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His presumption was that the train would be on time.
2.
behavior that is arrogant, disrespectful, or overconfident
:
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It was sheer presumption on his part to assume he could speak for everyone.
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His rude presumption offended many people.