1610s, Modern Latin logarithmus, coined by Scottish mathematician John Napier (1550-1617), literally "ratio-number," from Greek logos "proportion, ratio, word" (see logos) + arithmos "number" (see arithmetic).
logarithm (lô'gə-rĭ'əm) The power to which a base must be raised to produce a given number. For example, if the base is 10, then the logarithm of 1,000 (written log 1,000 or log_{10} 1,000) is 3 because 10^{3} = 1,000. See more at common logarithm, natural logarithm. |