Turbulence (noun)

1. A state of confusion or agitation; a state of social, political, or economic disorder.
2. A condition of irregular and unpredictable movement of air or water, typically causing discomfort or difficulties for aircraft or ships.

Origin:

Late 16th century: from french, or from latin turbulentia, from turbulentus (see turbulent).

Examples:

1. The flight encountered turbulence and the passengers were told to fasten their seat belts.
2. The turbulence caused the plane to drop suddenly.
3. The stock market is in a state of turbulence.
4. The ocean was rough due to the turbulence caused by the storm.
5. The turbulence was caused by the wind blowing over the mountains.