presumption
Definitions
An idea that is taken to be true, and often used as the basis for other ideas, although it is not known for certain.
Behavior or attitude that is boldly disrespectful or arrogant.
A legal inference as to the truth of a fact in the absence of actual certainty or proof.
Examples
The legal system operates on the presumption of innocence until proven guilty.
It was a piece of pure presumption for him to assume he was invited to the private party.
Synonyms
assumption arrogance audacity conjecture supposition effrontery premise