logarithm

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈlɒgərɪð^əm/

US:USA pronunciation: IPAUSA pronunciation: IPA/ˈlɔgəˌrɪðəm, ˈlɑgə-/

US:USA pronunciation: respellingUSA pronunciation: respelling(lô′gə riᵺ′əm, -rith′-, log′ə-)

log•a•rithm /ˈlɔgəˌrɪðəm, ˈlɑgə-/USA pronunciation n. [countable]

Mathematicsthe exponent of the power to which a base number must be raised to equal a given number;
log:2 is the logarithm of 100 to the base 10 (2 = log₁₀ 100).

log•a•rith•mic, adj. See -log-.

log•a•rithm (lô′gə riᵺ′əm, -rith′-, log′ə-),USA pronunciation n. [Math.]

Mathematicsthe exponent of the power to which a base number must be raised to equal a given number;
log:2 is the logarithm of 100 to the base 10 (2 = log₁₀ 100).

Collins Concise English Dictionary © HarperCollins Publishers::

logarithm /ˈlɒɡəˌrɪðəm/ n

the exponent indicating the power to which a fixed number, the base, must be raised to obtain a given number or variable. It is used esp to simplify multiplication and division: if a^x = M, then the logarithm of M to the base a (written log_aM) is xOften shortened to: log
See also natural logarithm

Etymology: 17th Century: from New Latin logarithmus, coined 1614 by John Napier, from Greek logos ratio, reckoning + arithmos number

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