¹ book noun

• a set of printed sheets of paper that are held together inside a cover : a long written work —sometimes used figuratively
• a long written work that can be read on a computer : e-book
• a set of sheets of paper that are inside a cover and that you can write information on

² book verb

• to make arrangements so that you will be able to use or have (something, such as a room, table, or seat) at a later time
• to make arrangements for (someone) to do, use, or have something at a later time
• to schedule a performance or appearance by (someone, such as a musician)

³ book adjective

• learned from reading books and not from experience