fluctuating

adjective
fluc·​tu·​at·​ing | \ˈflək-chə-ˌwā-tiŋ, -chü-ˌā-\

Definition of fluctuating 

: changing frequently and uncertainly a period of fluctuating temperatures/prices a fluctuating signal

First Known Use of fluctuating

1612, in the meaning defined above

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The first known use of fluctuating was in 1612

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