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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] Our assertions and negations should be yea and nay. --Rogers. [1913 Webster] 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. [1913 Webster]