A chapter is a section of a book. Some long novels might be divided into twenty or thirty chapters.

The noun chapter is good for talking about a subset or small section of some larger thing. Book chapters are one example, and so is a chapter in a person's life or a chapter of an organization or club. When you mention the "mopey teenage chapter" of your life, you mean one small portion of the years you've lived. And the Montana chapter of a national fan club is made up of only members who live in one state.

Definitions of chapter
  1. noun
    a subdivision of a written work; usually numbered and titled
    “he read a chapter every night before falling asleep”
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    type of:
    section, subdivision
    a self-contained part of a larger composition (written or musical)
  2. noun
    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”
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    type of:
    phase, stage
    any distinct time period in a sequence of events
  3. noun
    a series of related events forming an episode
    “a chapter of disasters”
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    type of:
    a happening that is distinctive in a series of related events
  4. noun
    a local branch of some fraternity or association
    “he joined the Atlanta chapter
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    type of:
    club, gild, guild, lodge, order, social club, society
    a formal association of people with similar interests
  5. noun
    an ecclesiastical assembly of the monks in a monastery or even of the canons of a church
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    type of:
    a group of persons who are gathered together for a common purpose
Word Family

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