centripetal vs divergent

centripetal

adj
  • Directed towards the central nervous system; afferent. 

  • Directed or moving towards a centre. 

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

divergent

adj
  • Causing divergence of rays. 

  • Disagreeing from something given; differing. 

  • (said of a sequence or series) Diverging; not approaching a limit. 

  • Growing further apart; diverging. 

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