reservation

noun

• The act of reserving, withholding or keeping back.

  "The committee authorised the reservation of funds."

• Something that is withheld or kept back.
• (often in the plural) A limiting qualification; a doubt.

  "I have reservations about your intentions."

• A tract of land set apart by the US government for the use of a Native American people; Indian reservation (compare Canadian reserve).
• An arrangement by which accommodation or transport arrangements are secured in advance.

  "I have a hotel reservation in the name of Mr Smith."

• The area which separates opposing lanes of traffic on a divided motorway or dual carriageway; see also central reservation.

  "A vehicle crashed through the central reservation into the path of oncoming traffic."

• 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).