Meaning of “reserve” - Learner’s Dictionary

reserve

noun uk us /rɪˈzɜːv/
SUPPLY [ C ]

a supply of something that you keep until it is needed:

emergency cash reserves
in reserve

ready to be used if you need it:

I always keep a little money in reserve.
QUALITY [ U ]

behaviour that does not show what you are thinking or feeling

SPORT [ C ]

in sport, an extra player who is ready to play if one of the other players has an injury

AREA [ C ]

B2 an area of land where animals and plants are protected

→ See also nature reserve

(Definition of “reserve noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)