a function defined by y = logbx, especially when the base, b, is equal to e, the base of natural logarithms.
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British Dictionary definitions for logarithmic function
the mathematical function y = log x
a function that can be expressed in terms of this function
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012