Definition: negation

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Source: WordNet (r) 1.7 

negation
     n 1: the negative of the opposition
     2: the speech act of negating

Source: Webster's Revised Unabridged Dictionary (1913) 

Negation \Ne*ga"tion\, n. [L. negatio, fr. negare to say no, to
   deny; ne not + the root of aio I say; cf. Gr. ?, Skr. ah to
   say; cf. F. n['e]gation. See No, adv., and cf. Adage,
   Deny, Renegade.]
   1. The act of denying; assertion of the nonreality or
      untruthfulness of anything; declaration that something is
      not, or has not been, or will not be; denial; -- the
      opposite of affirmation.

            Our assertions and negations should be yea and nay.
                                                  --Rogers.

   2. (Logic) Description or definition by denial, exclusion, or
      exception; statement of what a thing is not, or has not,
      from which may be inferred what it is or has.