commitment vs constancy

commitment

noun
  • The trait of sincerity and focused purpose. 

  • The act of being locked away, such as in an institution for the mentally ill or in jail. 

  • The act of sending a legislative bill to committee for review. 

  • State of being pledged or engaged. 

  • Official consignment sending a person to prison or a mental health institution. 

  • Promise or agreement to do something in the future, especially 

  • Being bound emotionally or intellectually to a course of action or to another person or persons. 

  • Perpetration as in a crime or mistake. 

  • Act of assuming a financial obligation at a future date. 

constancy

noun
  • The quality of being constant; steadiness or faithfulness in action, affections, purpose, etc. 

  • An unchanging quality or characteristic of a person or thing. 

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