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
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