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.
      [1913 Webster]

            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.
   [1913 Webster]

         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]

Moby Thesaurus II by Grady Ward, 1.0:

106 Moby Thesaurus words for "saturate":
   allay, bathe, besprinkle, breathe, brew, brim, charge, chock,
   choke, cloy, color, congest, cram, crowd, decoct, douche, dredge,
   drench, drenched, dripping, drouk, dye, engorge, entincture, fill,
   fill to overflowing, fill up, flavor, flush, freight, glut,
   gluttonize, gorge, imbrue, imbue, impregnate, infiltrate, infuse,
   inject, inoculate, instill, interpenetrate, jade, jam, jam-pack,
   lade, lave, leach, leaven, lixiviate, load, macerate, overburden,
   overcharge, overdose, overfeed, overfill, overgorge, overlade,
   overload, oversaturate, overstuff, overweight, pack, pad, pall,
   penetrate, percolate, permeate, pervade, pierce, probe, ram in,
   rinse, sate, satiate, satisfy, saturated, season, seethe, slake,
   soak, soaked, soaking, sodden, sop, sopping, souse, soused, steep,
   stuff, suffuse, supercharge, supersaturate, surcharge, surfeit,
   temper, tincture, tinge, top off, transfuse, wad, wash, waterlog,
   weight, wet