Assumption
Part of speech: noun
Definition: The act of assuming, or taking to or upon one's self; the act of taking up or adopting. The act of taking for granted, or supposing a thing without proof; a supposition; an unwarrantable claim. The thing supposed; a postulate, or proposition assumed; a supposition. The minor or second proposition in a categorical syllogism. The taking of a person up into heaven. A festival in honor of the ascent of the Virgin Mary into heaven.
Example sentence: The Congressional Budget Office has been embarrassed repeatedly by making projections based on the assumption that tax revenues and tax rates move in the same direction.
Presumptuousness
Part of speech: noun
Definition: The state of being presumptuous.