Meaning of “booking” - Learner’s Dictionary

booking

noun [ C, U ] uk us /ˈbʊkɪŋ/ mainly UK

B1 an arrangement you make to have a hotel room, tickets, etc at a particular time in the future:

Many hotels won't accept bookings for less than two nights.
advance booking

(Definition of “booking” from the Cambridge Learner’s Dictionary © Cambridge University Press)