presumption in WordNet English dictionary

1. audacious (even arrogant) behavior that you have no right to
   "he despised them for their presumptuousness"
   presumption  presumptuousness  effrontery  assumption 
   
2. an assumption that is taken for granted
   given  presumption  precondition 
   
3. a kind of discourtesy in the form of an act of presuming
   "his presumption was intolerable"
   presumption 
   
4. (law) an inference of the truth of a fact from other facts proved or admitted or judicially noticed
   presumption