from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To make thinner or less concentrated by adding a liquid such as water.
  • transitive v. To lessen the force, strength, purity, or brilliance of, especially by admixture.
  • transitive v. To decrease the value of (shares of stock) by increasing the total number of shares.
  • adj. Weakened; diluted.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To make thinner by adding solvent to a solution; especially by adding water.
  • v. To weaken, especially by adding a foreign substance.
  • v. To cause the value of individual shares to decrease by increasing the total number of shares.
  • adj. Having a low concentration.
  • adj. Weak; reduced in strength due to dilution, diluted.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Diluted; thin; weak.
  • intransitive v. To become attenuated, thin, or weak.
  • transitive v. To make thinner or more liquid by admixture with something; to thin and dissolve by mixing.
  • transitive v. To diminish the strength, flavor, color, etc., of, by mixing; to reduce, especially by the addition of water; to temper; to attenuate; to weaken.

from The Century Dictionary and Cyclopedia

  • To render more liquid; make thin or more fluid, as by mixture of a fluid of less with one of greater consistence; attenuate the strength or consistence of: often used figuratively: as, to dilute a narrative with weak reflections.
  • Hence To weaken, as spirit or an acid, by an admixture of water or other liquid, which renders the spirit or acid less concentrated.
  • To make weak or weaker, as color, by mixture; reduce the strength or standard of.
  • To become liquid or more liquid; become thin or reduced in strength: as, vinegar dilutes easily.
  • Thin; attenuated; reduced in strength, as spirit or color.
  • Weak; paltry; poor.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. reduced in strength or concentration or quality or purity
  • v. lessen the strength or flavor of a solution or mixture
  • v. corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones


Latin dīluere, dīlūt- : dī-, dis-, apart, away; see dis- + -luere, to wash (from lavere; see leu(ə)- in Indo-European roots).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin dilutus, from diluere ("to wash away, dissolve, cause to melt, dilute"), from di-, dis- ("away, apart") + luere ("to wash"). See lave, and compare deluge. (Wiktionary)



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