/ ˈfluːənsi; NAmE / noun [ U , sing. ]
1.
the quality of being able to speak or write a language, especially a foreign language, easily and well :
Fluency in French is required for this job.
2.
the quality of doing sth in a smooth and skilful way :
The team lacked fluency during the first half.
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WORD ORIGIN
early 17th cent.: from Latin fluentia , from fluere to flow.