meditation vs rumination

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. 

rumination

noun
  • Deep thought or consideration. 

  • The act of ruminating; i.e. chewing cud. 

  • Negative cyclic thinking; persistent and recurrent worrying or brooding. 

  • An eating disorder characterized by repetitive regurgitation of small amounts of food from the stomach. 

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