reservation

noun

1. Something that is withheld or kept back.
2. A limiting qualification regarding certainty or risk; a doubt or concern.
3. A tract of land set apart by the US government for the use of a Native American people, such as the Hopi Reservation or the Navajo Nation's territory.
4. An arrangement by which accommodation or transport arrangements are secured in advance.
5. The area which separates opposing lanes of traffic on a divided motorway or dual carriageway.
6. The setting aside of a certain percentage of vacancies in government institutions for members of backward and underrepresented communities (defined primarily by caste and tribe).
7. A power of an overseeing authority to suspend legislation in the jurisdiction being overseen pending the approval of a higher authority. Such as a provincial/state governor reserving a bill passed by the state/provincial legislature from assent, pending approval of the federal government; or a federal bill passed by federal parliament being reserved by the viceroy pending approval by the crown.