presumption Meaning in the Cambridge English Dictionary
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Meaning of “presumption” in the English Dictionary

"presumption" in British English

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presumptionnoun [C or U]

uk   us   /prɪˈzʌmp.ʃən/
C1 the ​act of ​believing that something is ​true without having any ​proof: The presumption of ​innocence is ​central to American ​law. There is no ​scientificevidence to ​support such presumptions. [+ that] The ​decision is ​based on the presumption that all ​information must be ​freelyavailable.
(Definition of presumption from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"presumption" in American English

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presumptionnoun

 us   /prɪˈzʌmp·ʃən/

presumption noun (BELIEF)

[C] a ​belief that something is ​true because it is ​likely, ​although not ​certain: There is no ​scientificevidence to ​support such presumptions.

presumption noun (RUDENESS)

[U] behavior that is ​rude or ​shows that you ​expect too much: What presumption, to ​assume that I’d ​pay for everyone!
(Definition of presumption from the Cambridge Academic Content Dictionary © Cambridge University Press)

"presumption" in Business English

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presumptionnoun [C or U]

uk   us   /prɪˈzʌmpʃən/
LAW the fact of believing that something is ​true without having any ​proof: Every ​defendant is ​entitled to the presumption of innocence unless they are ​proven guilty.presumption that The decision was ​based on the presumption that the ​information that they had been given was ​correct.
(Definition of presumption from the Cambridge Business English Dictionary © Cambridge University Press)
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