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English definition of “drainage”

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drainage

noun [U] uk   /ˈdreɪ.nɪdʒ/ us  
the system of water or waste liquids flowing away from somewhere into the ground or down pipes: drainage channels/ditches/systems the ability of soil to allow water to flow away: These plants need a sunny spot with good drainage.
(Definition of drainage from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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