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