What is the meaning of chapter?

noun

• A subdivision of a written work; usually numbered and titled.
  • usage: "he read a chapter every night before falling asleep"
• Any distinct period in history or in a person's life.
  • usage: "the industrial revolution opened a new chapter in British history"; "the divorce was an ugly chapter in their relationship"
• A local branch of some fraternity or association.
  • usage: "he joined the Atlanta chapter"
• An ecclesiastical assembly of the monks in a monastery or even of the canons of a church.
• A series of related events forming an episode.
  • usage: "a chapter of disasters"