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1.
Confirmation of anything established; ratification; as, the affirmation of a law.
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2.
The act of affirming or asserting as true; assertion; -- opposed to negation or denial.
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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.
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4.
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.(Law)