negation vs rebuttal

negation

noun
  • A denial or contradiction. 

  • 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".) 

  • The logical operation which obtains such (negated) propositions. 

  • The act of negating something. 

rebuttal

noun
  • The act of contradicting something by making a contrary argument, or presenting contrary evidence. 

  • A statement, designed to refute or negate specific arguments put forward by opponents. 

  • A pleading by a defendant in reply to the evidence put forward by a plaintiff or the prosecution. 

How often have the words negation and rebuttal occurred in a corpus of books? (source: Google Ngram Viewer )