subdivision vs unification

subdivision

verb
  • To separate something into smaller pieces. 

noun
  • Such a piece that has been divided. 

  • A division into smaller pieces of something that has already been divided. 

  • A parcel of land that has been divided into lots. 

  • A group of houses created by the same builder or in the same general area. 

  • A gated community. 

unification

noun
  • Given two terms, their join with respect to a specialisation order. 

  • The act of unifying. 

  • The state of being unified. 

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