diametral vs divergent

diametral

adj
  • Contrary; diametrically opposed. 

  • Of, relating to, or measured across a diameter. 

divergent

adj
  • Disagreeing from something given; differing. 

  • Causing divergence of rays. 

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

  • Growing further apart; diverging. 

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