Meaning of “presumption” - Learner’s Dictionary

presumption

noun uk us /prɪˈzʌmpʃən/
BELIEF [ C ]

the belief that something is true without any proof:

[ + (that) ] I object to the presumption that young people are only interested in pop music.
BEHAVIOUR [ U ]

behaviour that is rude and does not show respect

(Definition of “presumption” from the Cambridge Learner’s Dictionary © Cambridge University Press)