A chapter is one of the main divisions of a book, usually with its own number or title. It can also mean a specific period or part of someone's life or of an organization’s history.
From Old French 'chapitre', from Latin 'capitulum' meaning 'little head', a diminutive of 'caput' (head). Chapters were seen as 'little headings' or sections under a main heading.
A chapter is literally a 'little head' in your book, one of many small leaders organizing the story. When people say 'a new chapter in my life', they’re treating their experiences like a book with built-in section breaks.
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