[log.a.rithm] n [NL logarithmus, fr. log- + Gk arithmos number--more at arithmetic] (ca. 1616): the exponent that indicates the power to which a number is raised to produce a given number "the ~ of 100 to the base
10. is 2" -- log.a.rith.mic adj -- log.a.rith.mi.cal.ly adv