ab- vs mid-

ab-

prefix
  • From. 

  • Away from; outside of. 

  • A unit of electromagnetic charge in the centimeter-gram-second system: the abcoulomb. 

mid-

prefix
  • Amid. 

  • Denoting the middle part. 

  • Occupying a middle position. 

  • Intermediate 

  • During, in the middle of doing something. 

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