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English definition of “reserve”

reserve

noun [C/U]    /rɪˈzɜrv/
something kept for a particular purpose or time, or the state of being kept for future use by someone: [C] I have a reserve of food in case of emergency. [U] The book is on reserve and can’t be checked out. She keeps a little money in reserve (= for use if and when needed). A reserve (also (also preserve)) is also an area of land kept for the protection of animals and plants: [C] a nature/game reserve The reserves are a part of a country’s armed forces that are not always on active duty but are available in an emergency.
(Definition of reserve noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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