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natural logarithm

noun

, Mathematics.
  1. a logarithm having e as a base. : ln


natural logarithm

noun

  1. a logarithm to the base e. Usually written log e or ln Also calledNapierian logarithm Compare e common logarithm


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).
  2. See more at eCompare common logarithm


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Word History and Origins

Origin of natural logarithm1

First recorded in 1810–20
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Example Sentences

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.

To figure out a dog’s biological age, they say, multiply the natural logarithm of the dog’s age in years by 16.

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