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[law-guh-rith -mik, -rith-, log-uh-] /ˌlɔ gəˈrɪð mɪk, -ˈrɪθ-, ˌlɒg ə-/
adjective, Mathematics.
pertaining to a logarithm or logarithms.
(of an equation) having a logarithm as one or more of its unknowns.
  1. pertaining to the function y = log x.
  2. expressible by means of logarithms.
Also, logarithmical.
Origin of logarithmic
First recorded in 1690-1700; logarithm + -ic
Related forms
logarithmically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for logarithmic
Historical Examples
  • The common snail-shell is constructed according to logarithmic laws.

    Insect Adventures J. Henri Fabre
  • By this characteristic we recognize the ‘logarithmic spiral.’

    The Life of the Spider J. Henri Fabre
  • Should logarithmic tables be withheld from him until the theoretical foundation is laid in the mind of the pupil?

    William Oughtred Florian Cajori
  • Sixty seconds later the Brainchild began her long, logarithmic drop toward the surface of Eisberg.

    Unwise Child Gordon Randall Garrett
  • Such tables can scarcely be said to come under the head of logarithmic tables.

  • Now is this logarithmic spiral, with its curious properties, merely an idea of the geometricians?

    Insect Adventures J. Henri Fabre
  • For she is not related to the Worm; and yet she is familiar with the logarithmic spiral and uses it in her web, in a simpler form.

    Insect Adventures J. Henri Fabre
  • The curve is a logarithmic spiral, and the use of the instrument involves no other labor than that of setting it in position.

  • The Professor, a logarithmic machine, and I had had a falling out not long before.

    John Marvel, Assistant Thomas Nelson Page
  • By this characteristic we recognize what geometricians have named the logarithmic spiral.

    Insect Adventures J. Henri Fabre
British Dictionary definitions for logarithmic


of, relating to, using, or containing logarithms of a number or variable
consisting of, relating to, or using points or lines whose distances from a fixed point or line are proportional to the logarithms of numbers
Derived Forms
logarithmically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for logarithmic

1690s, from logarithm + -ic. Related: Logarithmical (1630s).

Online Etymology Dictionary, © 2010 Douglas Harper
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