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Definition of Clear-air turbulence
1. Noun. Strong turbulence in an otherwise cloudless region that subjects aircraft to violent updrafts or downdrafts.
Generic synonyms: Turbulence
Definition of Clear-air turbulence
1. Noun. The erratic movement of air masses in the absence of any visual cues, especially such movement that causes unexpected turbulence to an aircraft. ¹
¹ Source: wiktionary.com