Turbulence
Etymology
From Latin turbulentus, "full of commotion, disorderly," from turba, "a crowd, a disturbance." The root literally evokes a jostling throng. Fluid dynamics adopted it for the disordered regime opposite to smooth "laminar" flow, and it remains one of the hardest problems in classical physics.
noun · /TUR-byuh-lunss/
The chaotic, swirling flow that arises when a fluid moves fast enough that smooth, orderly motion breaks down into eddies at every scale.
What it names
The messy, unpredictable churn that appears when a system is pushed too hard or fast to stay smooth — where small disturbances suddenly matter enormously.
Example
The merger looked tidy on paper, but the first six months were pure turbulence as two office cultures crashed into each other.
Related idea
Turbulence is disorder driven by too much energy in a flow; chaos is the deeper property that even simple, orderly-looking systems can become unpredictable.