contemplation vs rogation

contemplation

noun
  • Holy meditation. 

  • The act of looking forward to a future event 

  • The state of being considered or planned. 

  • The act of contemplating; musing; being highly concentrated in thought 

rogation

noun
  • A deeply serious and somber prayer or entreaty. 

  • The demand, by the consuls or tribunes, of a law to be passed by the people; a proposed law or decree. 

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