[ dih-loot, dahy-; adjective dahy-loot ]
/ dɪˈlut, daɪ-; adjective ˈdaɪ lut /

verb (used with object), di·lut·ed, di·lut·ing.

to make (a liquid) thinner or weaker by the addition of water or the like.
to make fainter, as a color.
to reduce the strength, force, or efficiency of by admixture.

verb (used without object), di·lut·ed, di·lut·ing.

to become diluted.


reduced in strength, as a chemical by admixture; weak: a dilute solution.

Origin of dilute

1545–55; < Latin dīlūtus washed away, dissolved (past participle of dīluere), equivalent to dī- di-2 + -lūtus, combining form of lautus (lav(ere) to wash + -tus past participle suffix)

Related forms

Can be confused

dilate dilute
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for dilute

British Dictionary definitions for dilute


/ (daɪˈluːt) /


to make or become less concentrated, esp by adding water or a thinner
to make or become weaker in force, effect, etche diluted his story


  1. (of a solution, suspension, mixture, etc) having a low concentration or a concentration that has been reduced by admixture
  2. (of a substance) present in solution, esp a weak solution in waterdilute acetic acid

Derived Forms

dilutee, noundiluter, noun

Word Origin for dilute

C16: from Latin dīluere, from dis- apart + -luere, from lavāre to wash
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

Medicine definitions for dilute


[ dī-lōōt, dĭ- ]


To reduce a solution or mixture in concentration, quality, strength, or purity, as by adding water.


Thinned or weakened by diluting.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.