Meaning of assumption

as•sump•tion

1. something taken for granted; a supposition: a correct assumption.
2. the act of taking for granted or supposing.
3. the act of taking to or upon oneself.
4. the act of taking possession of something: the assumption of power.
5. arrogance; presumption.
6. the taking over of another's debts or obligations.
1. (often cap.) the bodily taking up into heaven of the Virgin Mary.
2. (cap.) a feast commemorating this, celebrated on August 15.