Turbulence, In fluid mechanics, a flow condition (see turbulent flow) in which local speed and pressure change unpredictably as an average flow is maintained. Common examples are wind and water swirling around obstructions, or fast flow (Reynolds number greater than 2,100) of any sort. Eddies, Use the noun turbulence to describe instability or disturbance. If you’re on an airplane during a storm, turbulence is that horrible thing that is causing the plane (and your stomach) to bounce around. TURBULENCE definition: 1. a state of confusion without any order: 2. strong sudden movements within air or water: 3. a…. Learn more. Turbulence is a state or condition of confusion, movement, or agitation; disorder. It can also refer to turbulent flow, eddying motion, or instability in the atmosphere, oceans, or rivers. See synonyms, antonyms, and translations of turbulence.