Turbulence

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late Middle English: from Old French, or from late Latin turbulentia, from turbulentus ‘full of commotion’ (see turbulent).

wiktionary

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Borrowed from Latin turbulentia, or from turbulent +‎ -ence.

etymonline

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turbulence (n.)

early 15c., from Late Latin turbulentia "trouble, disquiet," from Latin turbulentus (see turbulent). In reference to atmospheric eddies that affect airplanes, by 1918. Related: Turbulency.