noun
chapter
CHAP-ter/ˈtʃæptər/
A major subdivision of a larger work or organization.
A small Roman numeral marks the new chapter in the open book.

Etymology
Capitulum literally meant “little head,” but also named a main division of a book. Its parent word for “head” already had a writing sense, “division” or “paragraph,” making the book sense an inherited figurative use.
In context
for most of the chapter endings in this book, the main character is on a quiz show
More examples
- Our local chapter organizes a monthly cleanup.
- Retirement opened a new chapter in his life.
- The book's third chapter explains the experiment.
Forms
chapter · chapters
Similar words
- section
- Section is any subdivision; chapter is usually a major named division or organizational unit.