dilution

from WordNet (r) 3.0 (2006)

dilution
    n 1: a diluted solution
    2: weakening (reducing the concentration) by the addition of
       water or a thinner [ant: {concentration}]

from The Collaborative International Dictionary of English v.0.48

Dilution \Di*lu"tion\, n. [Cf. F. dilution.]
   The act of diluting, or the state of being diluted.
   --Arbuthnot.
   [1913 Webster]

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