# natural logarithm

### noun Mathematics.

a logarithm having e as a base. Symbol: ln

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Also called Napierian logarithm.

Compare common logarithm.

## Origin of natural logarithm

First recorded in 1810–20

## Words nearby natural logarithm

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

## British Dictionary definitions for natural logarithm

natural logarithm

### noun

a logarithm to the base e. Usually written log e or lnAlso called: Napierian logarithm Compare e (def. 1), common logarithm

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

## Scientific definitions for natural logarithm

natural logarithm

A logarithm using base e. Natural logarithms are common in mathematics, especially in cases involving complex numbers. They are also called Napierian logarithms, after their inventor, English mathematician John Napier (1550-1617). See more at e. Compare common logarithm.

The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.