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- (uncountable) The state or fact of being turbulent or agitated; tempestuousness, disturbance.
- (uncountable) Disturbance in a gas or fluid, characterized by evidence of internal motion or unrest.
- (uncountable) Specifically, a state of agitation or disturbance in the air which is disruptive to an aircraft.
- An instance or type of such state or disturbance.
disturbance in gas, fluid