Definition of "Assumption" :

noun: the act of taking possession of or power over something

"His assumption of office coincided with the trouble in Cuba."

noun: the act of assuming or taking for granted

"Your assumption that I would agree was unwarranted."

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

noun: a hypothesis that is taken for granted

"Any society is built upon certain assumptions."

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

"On the assumption that he has been injured we can infer that he will not play."

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

noun: celebration in the Roman Catholic Church of the Virgin Mary's being taken up into heaven when her earthly life ended; corresponds to the Dormition in the Eastern Orthodox Church