logarithm

n. power to which a base must be raised to produce a given number (Mathematics)

In mathematics, a logarithm (to base b) of a number x is the exponent y that satisfies x = by. It is written logb(x) or, if the base is implicit, as log(x).In other words is equivalent to
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Noun
1. the exponent required to produce a given number
(synonym) log
(hypernym) exponent, power, index
(hyponym) common logarithm

(n.)
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.
  

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