Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “logarithm”


noun [C]     /ˈlɒɡ.ə.rɪ.ðəm/ US  /ˈlɑː.ɡə-/ (informal log)
the number that shows how many times a number, called the base, has to be multiplied by itself to produce another number. Adding or taking away logarithms can replace multiplying or dividing large numbers.Numbers generally logarithmic     /ˌlɒɡ.ərˈɪð.mɪk/ US  /ˌlɑː.ɡəˈrɪð-/ adjective Numbers generally logarithmically     /ˌlɒɡ.ərˈɪð.mɪ.kəl.i/ US  /ˌlɑː.ɡəˈrɪð-/ adverb Numbers generally
(Definition of logarithm noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of logarithm

Definitions of “logarithm” in other dictionaries

Word of the Day


a document given to students or reporters which contains information about a particular subject

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More