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[dih-loo-shuh n, dahy-] /dɪˈlu ʃən, daɪ-/
the act of diluting or the state of being diluted.
something diluted.
Origin of dilution
1640-50; dilute + -ion
Related forms
antidilution, adjective
nondilution, noun
overdilution, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for dilution
Historical Examples
  • Tables were prepared by means of which simple calculations for the dilution of any given latex could be made.

  • For the second dilution it would take 10,000 drops, or about a pint.

    Medical Essays Oliver Wendell Holmes, Sr.
  • It is difficult with makeshift devices to gauge this dilution accurately for every motor speed.

    Aviation Engines Victor Wilfred Pag
  • Instead of being the 30th dilution, it is about the 30th concentration.

    The Red Acorn John McElroy
  • Why have you accepted his dilution of nonsense on Verlaine and Huysmans?

    Very Woman Remy de Gourmont
  • This staining can only be limited by dilution, but not by the addition of opposed dyes.

    Histology of the Blood Paul Ehrlich
  • As to dilution, it is now accepted by the men, who said when it was proposed to them: "Why didn't you come to us six months ago?"

  • dilution, or addition of water, at once discharges the colour.

  • Goodale begins with five drops of that dilution that just fails to cause a skin reaction.

    The Treatment of Hay Fever George Frederick Laidlaw
  • The dilution may be too great or too small to meet the needs of the infant.

    Dietetics for Nurses Fairfax T. Proudfit
British Dictionary definitions for dilution


the act of diluting or state of being diluted
a diluted solution
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 dilution

1640s, noun of action from past participle stem of Latin diluere (see dilute).

Online Etymology Dictionary, © 2010 Douglas Harper
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dilution in Medicine

dilution di·lu·tion (dī-lōō'shən, dĭ-)

  1. The act of reducing the concentration of a mixture or solution.

  2. A diluted solution.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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dilution in Science
The process of making a substance less concentrated by adding a solvent, such as water.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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