noun A collection of sheets of paper bound together to hinge at one edge, containing printed or written material, pictures, etc.
She opened the book to page 37 and began to read aloud.
noun A long work fit for publication, typically prose, such as a novel or textbook, and typically published as such a bound collection of sheets, but now sometimes electronically as an e-book.
I have three copies of his first book.
noun A major division of a long work.
Genesis is the first book of the Bible.
noun A record of betting (from the use of a notebook to record what each person has bet).
I'm running a book on who is going to win the race.
noun A bookmaker (a person who takes bets on sporting events and similar); bookie; turf accountant.
noun A convenient collection, in a form resembling a book, of small paper items for individual use.