'Drainage' definitions:

Definition of 'drainage'

From: WordNet
noun
Emptying something accomplished by allowing liquid to run out of it [syn: drain, drainage]

Definition of 'Drainage'

From: GCIDE
  • Drainage \Drain"age\, n.
  • 1. A draining; a gradual flowing off of any liquid; also, that which flows out of a drain. [1913 Webster]
  • 2. The mode in which the waters of a country pass off by its streams and rivers. [1913 Webster]
  • 3. (Engin.) The system of drains and their operation, by which superfluous water is removed from towns, railway beds, mines, and other works. [1913 Webster]
  • 4. Area or district drained; as, the drainage of the Po, the Thames, etc. --Latham. [1913 Webster]
  • 5. (Surg.) The act, process, or means of drawing off the pus or fluids from a wound, abscess, etc. [1913 Webster]
  • Drainage tube (Surg.), a tube introduced into a wound, etc., to draw off the discharges. [1913 Webster]