noun (n)

• the indistinct sound of people whispering(noun.event)

  Synonym:
  susurrus
  

  source: wordnet30
• speaking softly without vibration of the vocal cords(noun.communication)

  Synonym:
  voicelessness, whisper, whispering
  

  source: wordnet30
• A whispering; a soft murmur.(noun)

  source: webster1913