What is the meaning of subdivision?

noun

• An area composed of subdivided lots.
• The act of subdividing; division of something previously divided.
• A division of some larger or more complex organization.
  • usage: "a branch of Congress"; "botany is a branch of biology"; "the Germanic branch of Indo-European languages"
  • synonyms: branch, arm
• A self-contained part of a larger composition (written or musical. )
  • usage: "he always turns first to the business section"; "the history of this work is discussed in the next section"
  • synonyms: section
• A section of a section; a part of a part; i. E., a part of something already divided.
  • synonyms: subsection