presumption

noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about presumption at Wordnik → Where our words come from →

1. An assumption that is taken for granted.
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