Jisho

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Noun, Suru verb, Transitive verb
1. denial; negation; repudiation; disavowal​Antonym: 肯定
  • その
  • ニュース
  • が
  • かのじょ彼女
  • に
  • おお大きな
  • ショック
  • を
  • あた与えた
  • こと事
  • は
  • ひてい否定
  • しよう
  • も
  • ない
  • 。
It is not to be denied but that the news was a great shock to her.
Noun
2. negation​Logic
Noun
3. NOT operation​Computing
Wikipedia definition
4. Negation​In logic and mathematics, negation, also called logical complement, is an operation on propositions, truth values, or semantic values more generally. Intuitively, the negation of a proposition is true when that proposition is false, and vice versa. In classical logic negation is normally identified with the truth function that takes truth to falsity and vice versa.
Read “Negation” on English Wikipedia
Read “否定” on Japanese Wikipedia
Read “Negation” on DBpedia

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