The act or process of writing something down in a book or books, e.g. in accounting. | A reservation for a service, such as travel or hotel accommodation. | The engagement of a performer for a particular performance. | The issuing of a caution which is usually written down in a book, and results in a yellow card or (after two bookings) a red card, that is to say, the player is sent from the field of play. | The process of photographing, fingerprinting and recording the identifying data of a suspect following arrest.