chapter
In Italian, the word 'capitolo' is used to refer to a chapter in a book or other written work. It can also be used metaphorically to refer to a distinct period or phase in a longer process or narrative.
We discussed chapter 4 at school today.
In this sentence, the speaker shares that they talked about the fourth chapter of a particular book or topic at school on that day.
Every chapter of her life seems like a novel.
This is a metaphorical use of the word 'chapter', comparing different phases or periods in a person's life to chapters in a novel.