To arrange for something to be kept for the use of a particular person or at a particular time. verb
I would like to reserve a table for two at the restaurant.
She called the hotel to reserve a room for the weekend.
To retain or hold something back for future use or a special purpose. verb
He decided to reserve judgment until he had more information.
Please reserve some of the cake for the guests who will arrive later.
To set aside or keep something for a particular person or purpose. verb
The library reserves certain books for in-library use only.
The company reserves the right to change the terms of service at any time.