# logarithmic function

## noun

**:**a function (such as

*y*= log

*or*

_{a}x*y*= ln

*x*) that is the inverse of an exponential function (such as

*y*=

*a*or

^{x}*y*=

*e*) so that the independent variable appears in a logarithm

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Merriam-Webster unabridged
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