Definition of chapter
1a
: a main division of a book
b
: something resembling a chapter in being a significant specified unit
a new chapter in my life
2a
: a regular meeting of the canons of a cathedral or collegiate church or of the members of a religious house
b
: the body of canons of a cathedral or collegiate church
3
: a local branch of an organization
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Merriam-Webster unabridged
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Time Traveler for chapter
The first known use of chapter was in the 13th century
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