[sym.pho.ny] n, pl -nies [ME symphonie, fr. MF, fr. L symphonia, fr. Gk symphonia, fr. symphonos concordant in sound, fr. syn- + phone voice, sound--more at ban] (15c) 1: consonance of sounds
2. a: ritornello 1 b: sinfonia 1 c (1): a usu. long and complex sonata for symphony orchestra (2): a musical composition (as for organ) resembling such a symphony in complexity or variety
3: consonance or harmony of color (as in a painting)
4. a: symphony orchestra b: a symphony orchestra concert
5: something that in its harmonious complexity or variety suggests a symphonic composition