noun (n)

• a long and complex sonata for symphony orchestra(noun.communication)

  Synonym:
  symphonic music
  

  source: wordnet30
• a large orchestra; can perform symphonies(noun.group)

  Example:
  We heard the Vienna symphony.
  

  Synonym:
  philharmonic, symphony orchestra
  

  source: wordnet30
• A consonance or harmony of sounds, agreeable to the ear, whether the sounds are vocal or instrumental, or both.(noun)

  source: webster1913