Definition of "Reserve" :

noun: the trait of being uncommunicative; not volunteering anything more than necessary

noun: formality and propriety of manner

noun: armed forces that are not on active duty but can be called in an emergency

noun: a district that is reserved for particular purpose

noun: an athlete who plays only when a starter on the team is replaced

noun: something kept back or saved for future use or a special purpose

noun: (medicine) potential capacity to respond in order to maintain vital functions

verb: give or assign a resource to a particular person or cause

verb: obtain or arrange (for oneself) in advance

"We managed to reserve a table at Maxim's."

verb: hold back or set aside, especially for future use or contingency

verb: arrange for and reserve (something for someone else) in advance

"Reserve me a seat on a flight."