Source : Webster's Revised Unabridged Dictionary (1913)

Symphonic \Sym*phon"ic\, a.
   1. Symphonious.

   2. (Mus.) Relating to, or in the manner of, symphony; as, the
      symphonic form or style of composition.

Source : WordNet®

symphonic
     adj 1: relating to or characteristic or suggestive of a symphony;
            "symphonic choir"
     2: harmonious in sound; "the symphonic hum of a million
        insects" [syn: {symphonious}]