assumption

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act of taking to or upon oneself.
• noun The act of taking possession or asserting a claim.
• noun The act of taking for granted.
• noun Something taken for granted or accepted as true without proof; a supposition.
• noun Presumption; arrogance.
• noun Logic A minor premise.
• noun Christianity The taking up of the Virgin Mary into heaven in body and soul after her death, observed as a feast on August 15.

from The Century Dictionary.

• noun The act of taking to one's self; a taking upon one's self; undertaking.
• noun The act of taking for granted, or supposing without proof; supposition.
• noun The thing supposed; a postulate or proposition assumed.
• noun In logic, the minor premise in a categorical syllogism.
• noun [This use of the word, originating with Cicero (Latin assumptio), was revived in the sixteenth century, and is common in modern Latin, but is rare in English.]
• noun The taking up of a person into heaven; specifically, the traditional anticipated resurrection or bodily taking up into heaven of the Virgin Mary after her death, celebrated by the Roman Catholic, Greek, and Oriental churches by the feast of the Assumption on the 15th of August.
• noun Adoption, or making use of.
• noun In law, the agreement of the transferee of property to pay obligations of the transferror which are chargeable on it.
• noun A conceited disposition, characterized by a tendency to claim more than is one's due; presumption.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of assuming, or taking to or upon one's self; the act of taking up or adopting.
• noun The act of taking for granted, or supposing a thing without proof; supposition; unwarrantable claim.
• noun The thing supposed; a postulate, or proposition assumed; a supposition.
• noun (Logic) The minor or second proposition in a categorical syllogism.
• noun (Rom. Cath. & Greek Churches) The taking of a person up into heaven.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of assuming, or taking to or upon one's self; the act of taking up or adopting.
• noun The act of taking for granted, or supposing a thing without proof; a supposition; an unwarrantable claim.
• noun The thing supposed; a postulate, or proposition assumed; a supposition.
• noun logic The minor or second proposition in a categorical syllogism.
• noun The taking of a person up into heaven.
• noun A festival in honor of the ascent of the Virgin Mary into heaven.
• noun rhetoric Assumptio.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (Christianity) the taking up of the body and soul of the Virgin Mary when her earthly life had ended
• noun a statement that is assumed to be true and from which a conclusion can be drawn
• noun the act of taking possession of or power over something
• 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
• noun audacious (even arrogant) behavior that you have no right to
• noun a hypothesis that is taken for granted
• noun the act of assuming or taking for granted