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[C or U] when you keep something or a supply of something until it is needed, or a supply that you keepShe keeps a little money in reserve (= for use if and when needed).
The librarian has put the book on reserve for me (= will keep it for me when it becomes available).
We still have a reserve of food/food reserves in case of emergency.
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[C] (also reservation , US also preserve) an area of land kept in its natural state, especially for wild animals to live in and be protecteda nature/game/wildlife reserve
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[C] in sports, an extra player who is ready to play if neededWe had two reserves in case anyone was injured.
the reserves a group of people who are not permanently in the armed forces but are used only if neededThey will call up the reserves.