affirmation

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

• noun The act of affirming or the state of being affirmed; assertion.
• noun Something declared to be true; a positive statement or judgment.
• noun Law The assertion that the testimony one gives is true and equivalent to that which would be given while under oath.

from The Century Dictionary.

• noun The assertion that something is, or is true; the assignment of a certain character to an object: opposed to denial or negation.
• noun That which is affirmed; a proposition that is declared to be true; averment; assertion.
• noun Confirmation; ratification; establishment of something of prior origin.
• noun In law, the solemn declaration made by Quakers, Moravians, or others conscientiously opposed to taking oaths, in cases where an oath is generally required.

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

• noun Confirmation of anything established; ratification.
• noun The act of affirming or asserting as true; assertion; -- opposed to negation or denial.
• noun That which is asserted; an assertion; a positive statement; an averment.
• noun (Law) A solemn declaration made under the penalties of perjury, by persons who conscientiously decline taking an oath, which declaration is in law equivalent to an oath.

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

• noun A declaration that something is true; an oath.
• noun A form of self-forced meditation or repetition; autosuggestion.

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

• noun (religion) a solemn declaration that serves the same purpose as an oath (if an oath is objectionable to the person on religious or ethical grounds)
• noun the act of affirming or asserting or stating something
• noun a statement asserting the existence or the truth of something
• noun a judgment by a higher court that the judgment of a lower court was correct and should stand