subdivision in WordNet English dictionary

1. a division of some larger or more complex organization
   "a branch of Congress"; "botany is a branch of biology"; "the Germanic branch of Indo-European languages"
   branch  subdivision  arm 
   
2. a self-contained part of a larger composition (written or musical)
   "he always turns first to the business section"; "the history of this work is discussed in the next section"
   section  subdivision 
   
3. the act of subdividing; division of something previously divided
   subdivision 
   
4. a section of a section; a part of a part; i.e., a part of something already divided
   subsection  subdivision 
   
5. an area composed of subdivided lots
   subdivision