natural logarithm

noun Mathematics.

a logarithm having e as a base. Symbol: ln
Also called Napierian logarithm.
Compare common logarithm.

Origin of natural logarithm

First recorded in 1810–20

Words nearby natural logarithm

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British Dictionary definitions for natural logarithm

natural logarithm

noun

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

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.