The Collaborative International Dictionary of English v.0.48:

Assimilate \As*sim"i*late\, v. t. [imp. & p. p. Assimilated;
   p. pr. & vb. n. Assimilating.] [L. assimilatus, p. p. of
   assimilare; ad + similare to make like, similis like. See
   Similar, Assemble, Assimilate.]
   1. To bring to a likeness or to conformity; to cause a
      resemblance between. --Sir M. Hale.
      [1913 Webster]

            To assimilate our law to the law of Scotland. --John
                                                  Bright.
      [1913 Webster]

            Fast falls a fleecy; the downy flakes
            Assimilate all objects.               --Cowper.
      [1913 Webster]

   2. To liken; to compa?e. [R.]
      [1913 Webster]

   3. To appropriate and transform or incorporate into the
      substance of the assimilating body; to absorb or
      appropriate, as nourishment; as, food is assimilated and
      converted into organic tissue.
      [1913 Webster]

            Hence also animals and vegetables may assimilate
            their nourishment.                    --Sir I.
                                                  Newton.
      [1913 Webster]

            His mind had no power to assimilate the lessons.
                                                  --Merivale.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

125 Moby Thesaurus words for "assimilated":
   Americanized, Anglicized, accented, acculturated, acculturized,
   adopted, alveolar, amalgamated, apical, apico-alveolar,
   apico-dental, articulated, back, barytone, bilabial, blended,
   broad, cacuminal, central, cerebral, changed, checked, close,
   combinative, combinatory, combined, conjoint, conjugate,
   conjunctive, connective, consolidated, consonant, consonantal,
   continuant, converted, dental, dissimilated, dorsal, eclectic,
   flat, front, fused, glide, glossal, glottal, guttural, hard, heavy,
   high, incorporated, indoctrinated, integrated, intonated, joined,
   joint, labial, labiodental, labiovelar, lateral, lax, light,
   lingual, liquid, low, merged, mid, mixed, monophthongal, muted,
   narrow, nasal, nasalized, naturalized, occlusive, one, open,
   oxytone, palatal, palatalized, pharyngeal, pharyngealized,
   phonemic, phonetic, phonic, pitch, pitched, posttonic, reborn,
   redeemed, reformed, regenerated, renewed, retroflex, rounded,
   semivowel, soft, sonant, stopped, stressed, strong, surd, syllabic,
   syncretistic, syncretized, synthesized, tense, thick, throaty,
   tonal, tonic, transformed, twangy, unaccented, united, unrounded,
   unstressed, velar, vocalic, vocoid, voiced, voiceless, vowel,
   vowellike, weak, wide