The Collaborative International Dictionary of English v.0.48:

Bombardment \Bom*bard"ment\, n. [F. bombardement.]
   An attack upon a fortress or fortified town, with shells, hot
   shot, rockets, etc.; the act of throwing bombs and shot into
   a town or fortified place.
   [1913 Webster] Bombardo

WordNet (r) 3.0 (2006):

bombardment
    n 1: the rapid and continuous delivery of linguistic
         communication (spoken or written); "a barrage of
         questions"; "a bombardment of mail complaining about his
         mistake" [syn: barrage, bombardment, outpouring,
         onslaught]
    2: the heavy fire of artillery to saturate an area rather than
       hit a specific target; "they laid down a barrage in front of
       the advancing troops"; "the shelling went on for hours
       without pausing" [syn: barrage, barrage fire, battery,
       bombardment, shelling]
    3: the act (or an instance) of subjecting a body or substance to
       the impact of high-energy particles (as electrons or alpha
       rays)
    4: an attack by dropping bombs [syn: bombing, bombardment]