Book is a written or printed work consisting of pages glued or sewn together along one side and bound in covers.
In modern usage, book can also refer to:
1. A record of bets in gambling (e.g., "sports book")
2. To make a reservation (e.g., "book a hotel room")
3. A major division of a literary work (e.g., "Book of Genesis")
4. In accounting, a record of financial transactions (e.g., "bookkeeping")