middle vs perimeter

middle

noun
  • The middle stump. 

  • A centre, midpoint. 

  • The part between the beginning and the end. 

  • The central part of a human body; the waist. 

  • The middle voice. 

adj
  • Pertaining to the middle voice. 

  • Located in the middle; in between. 

  • Central. 

perimeter

noun
  • The length of such a boundary. 

  • The outer limits of an area. See synonyms at circumference. 

  • An instrument for determining the extent and shape of the field of vision. 

  • The sum of the distance of all the lengths of the sides of an object. 

  • A fortified strip or boundary usually protecting a military position. 

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