assumption

(ə-sŭmpˈshən)

1. The act of taking to or upon oneself: assumption of an obligation.
2. The act of taking possession or asserting a claim: assumption of command.
3. The act of taking for granted: assumption of a false theory.
4. Something taken for granted or accepted as true without proof; a supposition: a valid assumption.
5. Presumption; arrogance.
6. Logic A minor premise.
7. Assumption
   a. Christianity The taking up of the Virgin Mary into heaven in body and soul after her death.
   b. A feast celebrating this event.
   c. August 15, the day on which this feast is observed.