cogitation vs reflection

cogitation

noun
  • A carefully considered thought, idea, notion. 

  • The process of cogitating; contemplation, deliberation, reflection, meditation. 

reflection

noun
  • Careful thought or consideration. 

  • The act of reflecting or the state of being reflected. 

  • The process or mechanism of determining the capabilities of an object at run-time. 

  • The folding of a part; a fold. 

  • Something, such as an image, that is reflected. 

  • The property of a propagated wave being thrown back from a surface (such as a mirror). 

  • An implied criticism. 

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