The Collaborative International Dictionary of English v.0.48:

Saturate \Sat"u*rate\, v. t. [imp. & p. p. Saturated; p. pr. &
   vb. n. Saturating.] [L. saturatus, p. p. of saturare to
   saturate, fr. satur full of food, sated. See Satire.]
   1. To cause to become completely penetrated, impregnated, or
      soaked; to fill fully; to sate.
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            Innumerable flocks and herds covered that vast
            expanse of emerald meadow saturated with the
            moisture of the Atlantic.             --Macaulay.
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            Fill and saturate each kind
            With good according to its mind.      --Emerson.
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   2. (Chem.) To satisfy the affinity of; to cause to become
      inert by chemical combination with all that it can hold;
      as, to saturate phosphorus with chlorine.
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The Collaborative International Dictionary of English v.0.48:

Saturate \Sat"u*rate\, p. a. [L. saturatus, p. p.]
   Filled to repletion; saturated; soaked.
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         Dries his feathers saturate with dew.    --Cowper.
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         The sand beneath our feet is saturate
         With blood of martyrs.                   --Longfellow.
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WordNet (r) 3.0 (2006):

saturate
    v 1: cause (a chemical compound, vapour, solution, magnetic
         material) to unite with the greatest possible amount of
         another substance
    2: infuse or fill completely; "Impregnate the cloth with
       alcohol" [syn: impregnate, saturate]