drainage

noun

drain·​age ˈdrā-nij 

1

: the act, process, or mode of draining

also : something drained off

2

: a device for draining : drain

also : a system of drains

3

: an area or district drained

Examples of drainage in a Sentence

Recent Examples on the Web

Modern versions operate in irrigation networks, drainage projects, wastewater facilities, and low-head hydroelectric installations. — Atharva Gosavi, Interesting Engineering, 16 Aug. 2026

That could look like flooding of rivers, creeks, streams and low-lying areas or areas with poor drainage. — Katie Langford, Denver Post, 15 Aug. 2026

Previously, the incline was about 3ft (91cm) from the Leazes down to the Gallowgate, but that is believed to have dropped by around a third after the installation of a state-of-the-art drainage system and improved foundations. — Chris Waugh, New York Times, 14 Aug. 2026

If using a container, opt for one that’s at least ten inches deep with drainage. — Michelle Mastro, Architectural Digest, 14 Aug. 2026

Word History

First Known Use

1652, in the meaning defined at sense 1

Kids Definition

drainage

noun

drain·​age ˈdrā-nij 

1

a

: the act of draining

b

: something drained off

2

: a method of draining

also : a system of drains

Medical Definition

drainage

noun

drain·​age ˈdrā-nij 

1

: the act or process of drawing off fluids from a cavity or wound by means of suction or gravity

2

: a process of releasing internal conflicts or pent-up feelings (as hostility or guilt)