presumption
pre-sump-tion
noun
An idea or belief accepted as true without proof until disproved.
"There is a presumption of innocence in law."
noun
Behaviour or attitude that is arrogant, overconfident, or takes too much for granted.
"His presumption in speaking for us was rude."
Thesaurus
Synonyms: precondition, given, effrontery, assumption, presumptuousness