The Collaborative International Dictionary of English v.0.48:

Signalize \Sig"nal*ize\, v. t. [imp. & p. p. Signalized; p.
   pr. & vb. n. Signalizing.] [From Signal, a.]
   1. To make signal or eminent; to render distinguished from
      what is common; to distinguish.
      [1913 Webster]

            It is this passion which drives men to all the ways
            we see in use of signalizing themselves. --Burke.
      [1913 Webster]

   2. To communicate with by means of a signal; as, a ship
      signalizes its consort.
      [1913 Webster]

   3. To indicate the existence, presence, or fact of, by a
      signal; as, to signalize the arrival of a steamer.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "signalizing":
   connotative, demonstrative, denominative, denotative, designative,
   diagnostic, emblematic, evidential, exhibitive, expressive,
   figural, figurative, identifying, ideographic, idiosyncratic,
   implicative, indicating, indicative, indicatory, individual,
   meaningful, metaphorical, naming, pathognomonic, peculiar,
   representative, semantic, semiotic, significant, significative,
   signifying, suggestive, symbolic, symbolistic, symbological,
   symptomatic, symptomatologic, typical