term:

Book

book n

1 : a record of a business's financial transactions or financial condition often used in pl. [the s show a profit]
2 : police register
3 : the bets registered by a bookmaker
;also
: the business or activity of giving odds and taking bets
vt : to make (an arrested person) undergo booking

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.