aural vs centripetal

aural

adj
  • Of or pertaining to the ear. 

  • Of or pertaining to sound. 

  • Of or pertaining to an aura. 

centripetal

adj
  • Directed towards the central nervous system; afferent. 

  • Directed or moving towards a centre. 

  • Of, relating to, or operated by centripetal force. 

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