turbulence

Concise Oxford English Dictionary © 2008 Oxford University Press:
turbulent /ˈtəːbjʊl(ə)nt/

▶adjective

• 1 disorderly or confused; not calm or stable.

• 2 technical relating to or denoting irregular and disordered flow of fluids.

– derivatives
turbulence noun,
turbulently adverb.

– origin ME: from L. turbulentus ‘full of commotion’, from turba ‘crowd’.