Definition of streamline in English:

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Pronunciation: /ˈstriːmlʌɪn/


[with object]
1 (usually as adjective streamlined) Design or provide with a form that presents very little resistance to a flow of air or water, increasing speed and ease of movement: streamlined passenger trains
More example sentences
  • Keeping your body straight in the water, keeping streamlined, will determine how fast you'll go.
  • This will burn more fuel because of the extra drag caused by the rudder and because the aircraft is no longer streamlined.
  • Its body is sleek and streamlined, with muscles especially adapted to give a good forward push in water.
smooth, sleek, trim, elegant, graceful
technical faired
2Make (an organization or system) more efficient and effective by employing faster or simpler working methods: the company streamlined its operations by removing whole layers of management
More example sentences
  • It has 24 civilian staff and efforts have been made to improve its computer record system to streamline services.
  • ‘We want to introduce new efficiencies and streamline the service as much as possible,’ Mr McCarthy said.
  • The provincial government, meanwhile, says it is undertaking the changes as part of its effort to streamline the health care system.
efficient, smooth-running, well run, well organized, slick;
modernized, up to date, rationalized, simplified;
time-saving, labour-saving


A line along which the flow of a moving fluid is least turbulent.
Example sentences
  • The flow was largely laminar, and the streamlines remained remarkably coherent and showed little deviation during the course of the experiment.
  • As the wind progresses up the windward slope of the dune form, streamlines are compressed by the dune body, causing an acceleration of flow towards the crest.
  • Notice that each streamline changes in color as its temperature changes.


1(Of fluid flow) free from turbulence.
Example sentences
  • After the entire body is through the hole, maintain your streamline position and flatten out quickly to direct your energy toward the other end.
  • Once completely submerged in a streamline position, do three, four or five dolphin kicks, building from about 50 percent to 90 percent effort or more.
  • Our swimmers do their kicking drills in a streamline position, on their back, and also on their side (with one arm stretched out and the other on their side).
2 dated Having a streamlined shape: a streamline aeroplane
More example sentences
  • The controller has a streamline shape that looks more like a stealth airplane than a game controller.
  • This engine gave the aircraft sufficient power to enable its streamline shape to be used to its full advantage.
  • The building on the left is from the ‘decorative’ early period of art deco; on the right is an example from the later, unadorned streamline period.
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