01 n. The act of denying; assertion of the nonreality or untruthfulness of anything; declaration that something is not, or has not been, or will …
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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.
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2.
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.(Logic)