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a. (of a solution, suspension, mixture, etc.) having a low concentration or a concentration that has been reduced by admixture
b. (of a substance) present in solution, esp a weak solution in water
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
To make less concentrated.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.