Meaning of “presumptuous” in the English Dictionary

"presumptuous" in British English

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presumptuousadjective

uk /prɪˈzʌmp.tʃəs/ us /prɪˈzʌmp.tʃuː.əs/
presumptuously
adverb uk /prɪˈzʌmp.tʃəs.li/ us /prɪˈzʌmp.tʃuː.əs.li/
presumptuousness
noun [ U ] uk /prɪˈzʌmp.tʃəs.nəs/ us /prɪˈzʌmp.tʃuː.əs.nəs/ formal presumption

(Definition of “presumptuous” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"presumptuous" in American English

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presumptuousadjective

us /prɪˈzʌmp·tʃu·əs/

rude because of doing something although you know you do not have a right to do it:

It would be presumptuous of me to speak for the others.

(Definition of “presumptuous” from the Cambridge Academic Content Dictionary © Cambridge University Press)