negation
noun /nɪˈɡeɪʃn/
  /nɪˈɡeɪʃn/
(formal)- [countable, usually singular, uncountable] the exact opposite of something; the act of causing something not to exist or to become its opposite- This political system was the negation of democracy.
 
- [uncountable] the act of disagreeing with somebody/something or refusing to do something- She shook her head in negation.
 
Word Originlate Middle English: from Latin negatio(n-), from the verb negare ‘deny’.