Definition of reservoir noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈrezəvwɑː(r)//
    ; NAmE NAmE//ˈrezərvwɑːr//
    Rivers and lakes
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  1. 1a natural or artificial lake where water is stored before it is taken by pipes to houses, etc. See related entries: Rivers and lakes
  2. 2(formal) a large amount of something that is available to be used
  3. 3(specialist) a place in an engine or a machine where a liquid is kept before it is used an oil reservoir
  4. Word Originmid 17th cent.: from French réservoir, from réserver ‘to reserve, keep’.Extra examples We can tap into the vast reservoir of information available on the Internet The water content of the country’s reservoirs had fallen to less than 50% of their capacity. They got up early and went for a swim in the reservoir.
See the Oxford Advanced American Dictionary entry: reservoir