logarithmic function

noun

Definition of logarithmic function 

: a function (such as y = loga x or y = ln x) that is the inverse of an exponential function (such as y = ax or y = ex) so that the independent variable appears in a logarithm

First Known Use of logarithmic function

1836, in the meaning defined above

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The first known use of logarithmic function was in 1836

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