acquiescence vs ratification

acquiescence

noun
  • Inaction, passivity, or neglect to take legal action when it is called for in order to assert, preserve, or safeguard a right, and which inaction implies the abandonment of said right. 

  • A silent or passive assent or submission, or a submission with apparent content, distinguished from avowed consent on the one hand, and on the other, from opposition or open discontent; quiet satisfaction. 

ratification

noun
  • The act or process of ratifying, or the state of being ratified. 

  • A formal declaration of agreement to a treaty etc. 

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