noun (n)

• an outburst resembling the discharge of firearms or the release of bombs(noun.event)

  source: wordnet30
• rapid simultaneous discharge of firearms(noun.act)

  Synonym:
  burst, fusillade, volley
  

  source: wordnet30
• a sudden outburst of cheers(noun.communication)

  Example:
  There was a salvo of approval.
  

  source: wordnet30
• An exception; a reservation; an excuse.(noun)

  source: webster1913
• A concentrated fire from pieces of artillery, as in endeavoring to make a break in a fortification; a volley.(noun)

  source: webster1913