From The Collaborative International Dictionary of English v.0.48:

Affirmation \Af`fir*ma"tion\, n. [L. affirmatio: cf. F.
   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.
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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. (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.
      [1913 Webster]
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