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