n.
    - a main division of a book. ▸an Act of Parliament numbered as part of a session's proceedings. 
- a distinctive period in history or in a person's life.
- the governing body of a cathedral or other religious community, or of a knightly order.
- chiefly N. Amer. a local branch of a society.
Phrase
  
    - chapter and verse
 an exact reference or authority.
- a chapter of accidents
 a series of unfortunate events.
 
  Etymology
  ME: from OFr. chapitre, from L. capitulum, dimin. of caput ‘head’.