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English definition of “reservoir”

reservoir

noun [C]    /ˈrez·ərˌvwɑr, -ˌvwɔr/
a natural or artificial lake for storing and supplying water for an area A reservoir is also a large supply of something that could be used if needed : There’s a tremendous reservoir of goodwill out there.
(Definition of reservoir noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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