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natural logarithm

noun Mathematics.
  1. a logarithm having e as a base. Symbol: ln
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Origin of natural logarithm

First recorded in 1810–20
Also called Napierian logarithm.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for natural logarithm

natural logarithm

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

natural logarithm in Science

natural logarithm

  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.