Meaning of “reservation” - Learner’s Dictionary

reservation

noun uk us /ˌrezəˈveɪʃən/
ARRANGEMENT [ C ]

B1 an arrangement that you make to have a seat on an aircraft, a room in a hotel, etc:

I'd like to make a reservation for Friday evening.
DOUBT [ C, U ]

a doubt or a feeling that you do not agree with something completely:

I still have reservations about her ability to do the job.

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