acquiesce vs consent

acquiesce

verb
  • To concur upon conviction; to assent to; usually, to concur, not heartily but so far as to forbear opposition. 

  • To rest satisfied, or apparently satisfied, or to rest without opposition and discontent (usually implying previous opposition or discontent); to accept or consent by silence or by omitting to object. 

consent

verb
  • To agree in opinion or sentiment; to be of the same mind; to accord; to concur. 

  • To express willingness, to give permission. 

  • To cause to sign a consent form. 

noun
  • Voluntary agreement or permission. 

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