acquire vs adopt

acquire

verb
  • To gain, usually by one's own exertions; to get as one's own 

  • To sample signals and convert them into digital values. 

  • To contract. 

  • To get. 

adopt

verb
  • To take or receive as one's own what is not so naturally. 

  • To take voluntarily (a child of other parents) to be in the place of, or as, one's own child. 

  • To obtain (a pet) from a shelter or the wild. 

  • To take by choice into the scope of one's responsibility. 

  • To select and take or approve. 

  • To beat an opponent ten times in a row. 

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