reserve - noun

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

reserve - verb

• hold back or set aside, especially for future use or contingency
• give or assign a resource to a particular person or cause
• obtain or arrange (for oneself) in advance
• arrange for and reserve (something for someone else) in advance

reserve - thesaurus

allow   appropriate   backlog   book   earmark   hold   modesty   reservation   reticence   stockpile   substitute   taciturnity