natural logarithm

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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

natural killer cell, natural language, natural language processing, natural law, natural levee, natural logarithm, naturally, natural number, natural parent, natural person, natural philosophy

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use natural logarithm in a sentence

We can see this in FiveThirtyEight’s urbanization index, which captures how urban or rural an area is by calculating the natural logarithm of the average number of people living within a five-mile radius of another resident.
What Democrats Can Learn From Nebraska’s Shift To The Right|Ross Benes (rossbenes@gmail.com)|December 30, 2020|FiveThirtyEight
To figure out a dog’s biological age, they say, multiply the natural logarithm of the dog’s age in years by 16.
To figure out your dog’s ‘real’ age, you’ll need a calculator|Bethany Brookshire|August 12, 2020|Science News For Students

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.