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English definition of “drainage”

drainage

noun [U]     /ˈdreɪ.nɪdʒ/
the system of water or waste liquids flowing away from somewhere into the ground or down pipes : drainage channels / ditches / systems Plumbing and pipes and sewageMovement of liquids the ability of soil to allow water to flow away: These plants need a sunny spot with good drainage.Taking things away from someone or somewhereRemoving and getting rid of thingsRemoving and extracting
(Definition of drainage noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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