noun (n)

• a district that is reserved for particular purpose(noun.location)

  Synonym:
  reserve
  

  source: wordnet30
• a statement that limits or restricts some claim(noun.communication)

  Example:
  He recommended her without any reservations.
  

  Synonym:
  qualification
  

  source: wordnet30
• an unstated doubt that prevents you from accepting something wholeheartedly(noun.cognition)

  Synonym:
  arriere pensee, mental reservation
  

  source: wordnet30
• the act of reserving (a place or passage) or engaging the services of (a person or group)(noun.act)

  Synonym:
  booking
  

  source: wordnet30
• the written record or promise of an arrangement by which accommodations are secured in advance(noun.communication)

  source: wordnet30
• something reserved in advance (as a hotel accommodation or a seat on a plane etc.)(noun.cognition)

  source: wordnet30
• the act of keeping back or setting aside for some future occasion(noun.act)

  source: wordnet30
• The act of reserving, or keeping back; concealment, or withholding from disclosure; reserve.(noun)

  source: webster1913