exterior vs midpoint

exterior

adj
  • Being from outside a country; foreign. 

  • Outdoor. 

  • Relating to the outside parts or surface of something. 

noun
  • Foreign lands. 

  • The outside part, parts or surface of something. 

midpoint

noun
  • A point equidistant between two extremes. 

  • A point which divides a line segment into two lines of equal length. 

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