pre·sump·tion 
/prɪˈzʌmpʃən/ noun
plural pre·sump·tions /prɪˈzʌmpʃən/ noun 1 [count] : a belief that something is true even though it has not been proved — often + that ▪ The presumption is that the thief had a key to the store. ▪ There was a widespread presumption that she would appoint him as her successor. ▪ the presumption that all students learn in the same way ▪ Thousands of people used this drug on the presumption that it was safe. [=they used it because they believed that it was safe] 2 law : an act of accepting that something is true until it is proved not true — often + of [noncount] ▪ The trial was unfair from the beginning because there was no presumption of innocence. [singular] ▪ a defendant's right to a presumption of innocence 3 [noncount] formal : willingness to do something without the right or permission to do it
▪ You don't know anything about my situation, and yet you have the presumption [=(more commonly) gall, nerve] to tell me what to do!
▪ You don't know anything about my situation, and yet you have the presumption [=(more commonly) gall, nerve] to tell me what to do!
