Definitions from Wiktionary (negation)

▸ noun:  (uncountable) The act of negating something.
▸ noun:  (countable) A denial or contradiction.
▸ noun:  (logic, countable) A proposition which is the contradictory of another proposition and which can be obtained from that other proposition by the appropriately placed addition/insertion of the word "not". (Or, in symbolic logic, by prepending that proposition with the symbol for the logical operator "not".)
▸ noun:  (logic) The logical operation which obtains such (negated) propositions.
▸ Also see negation

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