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English definition of “book”

book

noun     /bʊk/
[C] a set of pages in a cover that you read or write in: book about/on sth She is author of three books about criminal procedure . The company publishes an extensive range of books. children's/ reference / self-help books an address book
books [plural] ACCOUNTING the written records of money that a business has spent or received : At the end of the year , the accountant goes over the books. John kept the books and helped her run her business . → See also appointment book, bankbook, the Beige Book, the Blue Book, cash received book, duplicate book, log book, minute book, order book, paying-in book, plat book, purchase book, rule book, sales day book, sales returns book, statutory book
go by the book (also do sth by the book) to do something exactly as the rules tells you: My lawyer always goes strictly by the book. This is a private deal - we don't have to do everything by the book.
on the books employed by a company or officially belonging to an organization : There are 256 people on the books at the cement works . Carla is on the books of a modelling agency .
(Definition of book noun from the Cambridge Business English Dictionary © Cambridge University Press)
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