apropos vs on target

apropos

prep
  • Regarding or concerning. 

adj
  • Of an appropriate or pertinent nature. 

  • by the way, incidental 

adv
  • To the purpose; appropriately. 

  • By the way. 

  • Timely; at a good time. 

on target

prep
  • Towards the goal. 

  • With accuracy. 

  • Accurate, or accurately predicted. 

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