a logarithm having e as a base. Symbol: ln
Compare common logarithm.
Origin of natural logarithm
First recorded in 1810–20
Also called Napierian logarithm.
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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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