meditation vs reflection

meditation

noun
  • Careful and thorough thought. 

  • A devotional exercise of, or leading to contemplation. 

  • A contemplative discourse, often on a religious or philosophical subject. 

  • A musical theme treated in a meditative manner. 

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 meditation and reflection occurred in a corpus of books? (source: Google Ngram Viewer )