The Collaborative International Dictionary of English v.0.48:

Symbolize \Sym"bol*ize\, v. i. [imp. & p. p. Symbolized; p.
   pr. & vb. n. Symbolizing.] [Cf. F. symboliser.]
   1. To have a resemblance of qualities or properties; to
      correspond; to harmonize.
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            The pleasing of color symbolizeth with the pleasing
            of any single tone to the ear; but the pleasing of
            order doth symbolize with harmony.    --Bacon.
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            They both symbolize in this, that they love to look
            upon themselves through multiplying glasses.
                                                  --Howell.
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   2. To hold the same faith; to agree. [R.]
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            The believers in pretended miracles have always
            previously symbolized with the performers of them.
                                                  --G. S. Faber.
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   3. To use symbols; to represent ideas symbolically.
      [1913 Webster]

WordNet (r) 3.0 (2006):

symbolizing
    n 1: the act of representing something with a symbol [syn:
         symbolizing, symbolising]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "symbolizing":
   apish, delineatory, depictive, echoic, embodying, figurative,
   graphic, ideographic, illustrational, illustrative, imitative,
   incarnating, limning, mimetic, mimish, onomatopoeic, personifying,
   pictographic, pictorial, portraying, representational,
   representative, representing, simulative, typifying, vivid