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From The Collaborative International Dictionary of English v.0.48:
Affirmation \Af`fir*ma"tion\, n. [L. affirmatio: cf. F. affirmation.] 1. Confirmation of anything established; ratification; as, the affirmation of a law. --Hooker. [1913 Webster] 2. The act of affirming or asserting as true; assertion; -- opposed to negation or denial. [1913 Webster] 3. That which is asserted; an assertion; a positive statement; an averment; as, an affirmation, by the vender, of title to property sold, or of its quality. [1913 Webster] 4. (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. --Bouvier. [1913 Webster]