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Definition of drainage noun from the Oxford Advanced American Dictionary

     

    drainage

     noun
    noun
    NAmE//ˈdreɪnɪdʒ//
     
    [uncountable]
     
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  1. 1the process by which water or liquid waste is drained from an area a drainage system/channel/ditch The area has good natural drainage.
  2. 2a system of drains
See drainage in the Oxford Advanced Learner's Dictionary
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