approve vs authenticate

approve

verb
  • To officially sanction; to ratify; to confirm; to set as satisfactory. 

  • To make profit of; to convert to one's own profit — said especially of waste or common land appropriated by the lord of the manor. 

  • To consider worthy (to); to be pleased (with); to accept. 

  • To regard as good; to commend; to be pleased with; to think well of. 

authenticate

verb
  • To render authentic; to give authority to, by the proof, attestation, or formalities required by law, or sufficient to entitle to credit. 

  • To prove authentic; to determine as real and true. 

adj
  • Synonym of authentic. 

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