Merriam-Webster Collegiate Dictionary - chapter

 noun  Etymology: Middle English chapitre, from Anglo-French chapitre, chapitle, from Late Latin capitulum division of a book & Medieval Latin, meeting place of canons, from Latin, diminutive of capit-, caput head — more at head  Date: 13th century  1.  a. a main division of a book  b. something resembling a ~ in being a significant specified unit a new ~ in my life  2.  a. 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