Definition of reservoir noun from the Oxford Advanced American Dictionary

     

    reservoir

     noun
    noun
    NAmE//ˈrɛzərˌvwɑr//
     
    , NAmE//ˈrɛzərˌvwɔr//
     
     
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  1. 1a natural or artificial lake where water is stored before it is taken by pipes to houses, etc.
  2. 2(formal) a large amount of something that is available to be used
  3. 3(technology) a place in an engine or a machine where a liquid is kept before it is used an oil reservoir
See the Oxford Advanced Learner's Dictionary entry: reservoir