negation
n. C1 Advanced US //nəˈɡeɪʃən// UK //nɪɡˈeɪʃən// nega·tion
n. the act of saying that something is not true or does not exist. You use this when you want to deny a statement.
n. the act of denying the truth or existence of something; the logical operation that produces a statement with the opposite truth value.
The negation of 'the sky is blue' is 'the sky is not blue'.
In formal logic, the negation of a proposition is often represented by the symbol ¬.
The philosopher argued that the negation of a universal statement is not merely a simple 'no' but a complex assertion of the existence of a counterexample.
From Middle English negacioun, from Old French negacion, from Latin negātiō (“a denial; negative word”). Morphologically negate + -ion.