presumption

(noun) an assumption that is taken for granted. Synonyms: given, precondition.

(noun) (law) an inference of the truth of a fact from other facts proved or admitted or judicially noticed.

(noun) audacious (even arrogant) behavior that you have no right to. Synonyms: presumptuousness, effrontery, assumption. Example: "He despised them for their presumptuousness."

(noun) a kind of discourtesy in the form of an act of presuming. Example: "His presumption was intolerable."