GNU Collaborative International Dictionary of English

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1.       
   Negation , 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. négation. See No, adv., and cf. Adage, Deny, Renegade.]
   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.
   1913 Webster
   Our assertions and negations should be yea and nay.
   Rogers.
   
   1913 Webster
   (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.
   1913 Webster