The Collaborative International Dictionary of English v.0.48:

Devastation \Dev`as*ta"tion\, n. [Cf. F. d['e]vastation.]
   1. The act of devastating, or the state of being devastated;
      a laying waste.
      [1913 Webster]

            Even now the devastation is begun,
            And half the business of destruction done.
                                                  --Goldsmith.
      [1913 Webster]

   2. (Law) Waste of the goods of the deceased by an executor or
      administrator. --Blackstone.

   Syn: Desolation; ravage; waste; havoc; destruction; ruin;
        overthrow.
        [1913 Webster]

WordNet (r) 3.0 (2006):

devastation
    n 1: the state of being decayed or destroyed [syn:
         devastation, desolation]
    2: the feeling of being confounded or overwhelmed; "her
       departure left him in utter devastation"
    3: an event that results in total destruction [syn:
       devastation, desolation]
    4: plundering with excessive damage and destruction [syn:
       ravaging, devastation]
    5: the termination of something by causing so much damage to it
       that it cannot be repaired or no longer exists [syn:
       destruction, devastation]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "devastation":
   bloodbath, blue ruin, breakup, carnage, confusion, consumption,
   damnation, decimation, depopulation, depredation, desolation,
   despoilment, despoliation, destruction, disintegration,
   disorganization, dispeoplement, disruption, dissolution, havoc,
   hecatomb, holocaust, loss, perdition, ravage, ruin, ruination,
   shambles, slaughter, spoliation, undoing, vandalism, waste, wrack,
   wrack and ruin, wreck