noun

• (gambling) 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."
• (informal) A bookmaker (a person who takes bets on sporting events and similar); bookie; turf accountant.
• (theater) The script of a musical or opera.
  "The guild helps ensure that the ownership and control of the music, lyrics, and book of a show remain in the hands of its authors and composers—not the producers."
• (usually in the plural) Records of the accounts of a business.

verb

• (transitive) To reserve (something) for future use.
  "I want to book a hotel room for tomorrow night."
• (transitive) To write down, to register or record in a book or as in a book.
  "They booked that message from the hill."
• (transitive) To add a name to the list of people who are participating in something.
  "I booked a flight to New York."
• (law enforcement, transitive) To record the name and other details of a suspected offender and the offence for later judicial action.
  "The police booked him for driving too fast."

verb

• (UK dialectal, Northern England) simple past of bake