[dih-loo-shuh n, dahy-]


the act of diluting or the state of being diluted.
something diluted.

Origin of dilution

First recorded in 1640–50; dilute + -ion
Related formsan·ti·di·lu·tion, adjectivenon·di·lu·tion, nouno·ver·di·lu·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for dilution

Historical Examples of dilution

  • But Mr. Drayton stopped the dilution by snatching up his tumbler.

    A Son of Hagar

    Sir Hall Caine

  • This staining can only be limited by dilution, but not by the addition of opposed dyes.

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

  • Is there not an infusion of Xenophon in Sophocles, as compared to Æschylus,—a dilution?

  • The twelfth dilution would of course fill a million such lakes.

    Medical Essays

    Oliver Wendell Holmes, Sr.

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

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

dilution in Medicine


[dī-lōōshən, dĭ-]


The act of reducing the concentration of a mixture or solution.
A diluted solution.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

dilution in Science



The process of making a substance less concentrated by adding a solvent, such as water.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.