LOGARITHM

Pronunciation (US):

(GB):

IPA (US):

 Dictionary entry overview: What does logarithm mean? 

• LOGARITHM (noun)
  The noun LOGARITHM has 1 sense:

1. the exponent required to produce a given number

  Familiarity information: LOGARITHM used as a noun is very rare.

 Dictionary entry details 

• LOGARITHM (noun)

Sense 1

Meaning:

The exponent required to produce a given number

Classified under:

Nouns denoting communicative processes and contents

Synonyms:

log; logarithm

Hypernyms ("logarithm" is a kind of...):

exponent; index; power (a mathematical notation indicating the number of times a quantity is multiplied by itself)

Hyponyms (each of the following is a kind of "logarithm"):

common logarithm (a logarithm to the base 10)

Napierian logarithm; natural logarithm (a logarithm to the base e)

Derivation:

logarithmic (of or relating to or using logarithms)

 Context examples 

A unit of potency expressed as a decadic logarithm of a of 50 percent infectious dose as defined in the particular fluorescent assay method per dose of preparation.

(Log10 Fluorescent Assay Infectious Dose 50 Percent per Dose, NCI Thesaurus)

A unit of potency expressed as a decadic logarithm of a of 50 percent infectious dose as defined in the particular fluorescent assay method.

(Log10 Fluorescent Assay Infectious Dose 50 Percent, NCI Thesaurus)

The single-tailed probability distribution of any random variable whose logarithm is normally distributed.

(Log Normal Distribution, NCI Thesaurus)

A logarithmic ratio unit (base-10 logarithms) used to express relative magnitude of a physical quantity (usually power or intensity) in comparison with a specified or implied reference level.

(Bel, NCI Thesaurus)

A unit of a speed of optical density change expressed as a logarithm of absorbance of light transmitted through a partially absorbing substance per minute.

(Absorbance Unit per Minute, NCI Thesaurus)

The negative logarithm (base 10) of the concentration of hydronium ions, which is used as a measure of the acidity or alkalinity of a fluid.

(pH, NCI Thesaurus/CDISC)

A unit of measure representing the intensity of an electrical signal or sound which is equal to ten times the logarithm of the ratio of two signals.

(Decibel, NCI Thesaurus)

A potency unit for measuring infectious activity of a biologic product or infectious agent equal to a base-10 logarithm of amount of product or agent preparation that causes infection in the 50% of embryos (such as chicken embryos) used in the product potency assay or pathogen activity assay.

(Log10 50 Percent Embryo Infective Dose, NCI Thesaurus)

A potency unit for measuring infectious activity of a biologic product or infectious agent preparation equal to a base-10 logarithm of amount of product or agent preparation that causes infection in the 50% of the cell culture-containing vessels inoculated with that dilution of infectious material in the product potency assay or pathogen activity assay.

(Log10 50 Percent Cell Culture Infective Dose, NCI Thesaurus)

Quantity of dimension one used to express on a scale from 0 to 14 the amount-of-substance concentration of hydrogen ion of dilute aqueous solution, calculated as the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter.

(pH, NCI Thesaurus)