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drainage (n.)

1650s, "act or process of draining," from drain (v.) + -age. Sense of "the water carried off by a system of rivers" is by 1860. Meaning "system by means of which something is drained" is by 1878.

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Definitions of drainage from WordNet

drainage (n.)
emptying something accomplished by allowing liquid to run out of it;
Synonyms: drain
From wordnet.princeton.edu