noun (n)

• an assumption that is taken for granted(noun.cognition)

  Synonym:
  given, precondition
  

  source: wordnet30
• (law) an inference of the truth of a fact from other facts proved or admitted or judicially noticed(noun.cognition)

  source: wordnet30
• audacious (even arrogant) behavior that you have no right to(noun.attribute)

  Synonym:
  assumption, effrontery, presumptuousness
  

  source: wordnet30
• a kind of discourtesy in the form of an act of presuming(noun.act)

  Example:
  His presumption was intolerable.
  

  source: wordnet30
• The act of presuming, or believing upon probable evidence; the act of assuming or taking for granted; belief upon incomplete proof.(noun)

  source: webster1913