/ Dictionary / Index L logarithm: Meaning and Definition of Find definitions for: log•a•rithm Pronunciation: (lô'gu-ri"um, -rith"-, log'u-), [key] — n. Math. the 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). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: logarithm (Thesaurus) logaoedic logarithmic Related Content Daily Word Quiz: verdant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language