the quality or state of being turbulent; violent disorder or commotion.
Hydraulics. the haphazard secondary motion caused by eddies within a moving fluid.
Meteorology. irregular motion of the atmosphere, as that indicated by gusts and lulls in the wind.
Also, turbulency.

1590–1600; < Late Latin turbulentia. See turbulent, -ence

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World English Dictionary
turbulence or (rarely) turbulency (ˈtɜːbjʊləns, ˈtɜːbjʊˌlənsɪ)
1.  a state or condition of confusion, movement, or agitation; disorder
2.  meteorol local instability in the atmosphere, oceans, or rivers
3.  turbulent flow in a liquid or gas
turbulency or (rarely) turbulency

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
turbulence   (tûr'byə-ləns)  Pronunciation Key 
Chaotic or unstable eddying motion in a fluid. Avoiding excessive turbulence generated around moving objects (such as airplanes), which can make their motion inefficient and difficult to control, is a major factor in aerodynamic design.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Whereas humans strive to minimize turbulence over aircraft wings, dragonflies'
  wings deliberately generate and exploit turbulence.
Air rushing over the birds' feathers produces turbulence.
The jagged edge mixes the airflow coming out of the jet engine in a way that
  reduces turbulence.
As it rises, the moisture condenses to form clouds, which are jostled by
  internal turbulence.
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