Definition of reserve:
formality and propriety of manner
something kept back or saved for future use or a special purpose
an athlete who plays only when a starter on the team is replaced
(medicine) potential capacity to respond in order to maintain vital functions
a district that is reserved for particular purpose
armed forces that are not on active duty but can be called in an emergency
the trait of being uncommunicative; not volunteering anything more than necessary
hold back or set aside, especially for future use or contingency; "they held back their applause in anticipation"
give or assign a resource to a particular person or cause; "I will earmark this money for your research"; "She sets aside time for meditation every day"
obtain or arrange (for oneself) in advance; "We managed to reserve a table at Maxim's"
arrange for and reserve (something for someone else) in advance; "reserve me a seat on a flight"; "The agent booked tickets to the show for the whole family"; "please hold a table at Maxim's"