Possible Definitions:
1. Reservation (n.) The act of reserving, or keeping back; concealment, or withholding from disclosure; reserve.
2. Reservation (n.) Something withheld, either not expressed or disclosed, or not given up or brought forward.
3. Reservation (n.) A tract of the public land reserved for some special use, as for schools, for the use of Indians, etc.
4. Reservation (n.) The state of being reserved, or kept in store.
5. Reservation (n.) A clause in an instrument by which some new thing is reserved out of the thing granted, and not in esse before.
6. Reservation (n.) A proviso.
7. Reservation (n.) The portion of the sacramental elements reserved for purposes of devotion and for the communion of the absent and sick.
8. Reservation (n.) A term of canon law, which signifies that the pope reserves to himself appointment to certain benefices.
