Logarithm
[l_ˈɒ_ɡ_ə_ɹ_ˌɪ_θ_ə_m], [lˈɒɡəɹˌɪθəm], [lˈɒɡəɹˌɪθəm]
Definitions of logarithm

the exponent required to produce a given number

One of a class of auxiliary numbers, devised by John Napier, of Merchiston, Scotland ( 1550 1617), to abridge arithmetical calculations, by the use of addition and subtraction in place of multiplication and division.

( of a number) The power to which another given number must be raised in order that it may equal the former number.

An exponent used to facilitate arithmetical calculations.

Logarithmic.

The exponent of the power to which a fixed number, called the base, must be raised to produce a certain other number.

A system of artificial numbers which greatly facilitate certain calculations, in such a way that while the natural numbers increase in geometrical progression, their logarithms increase in arithmetical progression only; thus, while 1, 2, 4, 8, 16, 32, 64 are natural numbers, 0, 1, 2, 3, 4, 5, 6 are their corresponding logarithms.