the.com/chapter

means A distinct section of a book, typically numbered or titled, that groups related content; by extension, a discrete phase in a life, story, or organization's history.

from From Latin 'caput' (head), via its diminutive 'capitulum' (little head, chapter heading). The word traveled into Old French as 'chapitre' before settling into English. The 'head' sense lingers everywhere: a chapter is the 'heading' under which a portion of text gathers. The organizational sense (a 'chapter' of a society or order) comes from the monastic practice of reading a chapter — a 'capitulum' — of rule or scripture aloud at daily meetings, so the gathering itself took the name of the text that opened it.