S: (n) reserve ((medicine) potential capacity to respond in order to maintain vital functions)
S: (n) reservation, reserve (a district that is reserved for particular purpose)
S: (n) military reserve, reserve (armed forces that are not on active duty but can be called in an emergency)
S: (n) reserve, reticence, taciturnity (the trait of being uncommunicative; not volunteering anything more than necessary)
Verb
S: (v) reserve (hold back or set aside, especially for future use or contingency) "they held back their applause in anticipation"
S: (v) allow, appropriate, earmark, set aside, reserve (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"
S: (v) reserve (obtain or arrange (for oneself) in advance) "We managed to reserve a table at Maxim's"
S: (v) reserve, hold, book (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"