Meaning of “preserve” - Learner’s Dictionary

preserve

noun uk us /prɪˈzɜːv/
FOOD [ C, U ] UK (US preserves)

a sweet food made from fruit, sugar, and water:

ACTIVITY [ no plural ]

an activity that only a particular group of people can do:

Sport used to be a male preserve.
Owning racehorses is the preserve of the rich.
AREA [ C ] mainly US

an area where wild animals and plants are protected

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