What does affirmation mean?
The definition of affirmation
Af`fir*ma”tion, n.
Etym: [L. affirmatio: cf. F. affirmation.]

1 Confirmation of anything established; ratification; as, the affirmation of a law. Hooker.
2 The act of affirming or asserting as true; assertion; — opposed to negation or denial.
3 That which is asserted; an assertion; a positive as, an affirmation, by the vender, of title to property sold, or of its quality.
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.