natural logarithm

noun

Mathematics.

1. a logarithm having e as a base. ln

natural logarithm

noun

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

Word History and Origins

Origin of natural logarithm¹

First recorded in 1810–20