negation vs oath

negation

noun
  • 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".) 

  • A denial or contradiction. 

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

  • The act of negating something. 

oath

noun
  • A light, irreverent or insulting appeal to a deity or other entity. 

  • A curse, a curse word. 

  • A solemn pledge or promise that invokes a deity, a ruler, or another entity (not necessarily present) to attest the truth of a statement or sincerity of one's desire to fulfill a contract or promise. 

  • A statement or promise which is strengthened (affirmed) by such a pledge. 

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