Assumption

a statement that is assumed to be true and from which a conclusion can be drawn

a hypothesis that is taken for granted

the act of taking possession of or power over something

celebration in the Roman Catholic Church of the Virgin Mary's being taken up into heaven when her earthly life ended

(Christianity) the taking up of the body and soul of the Virgin Mary when her earthly life had ended

audacious (even arrogant) behavior that you have no right to

the act of assuming or taking for granted