logarithmic function
noun Date: 1836 a function (as y = loga x or y = ln x) that is the inverse of an exponential function (as y = ax or y = ex) so that the independent variable appears in a logarithm

New Collegiate Dictionary. 2001.

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• logarithmic function — noun : a function that is a logarithm * * * Math. a function defined by y = logbx, esp. when the base, b, is equal to e, the base of natural logarithms. [1945 50] …   Useful english dictionary

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