noun (n)

• an act of plundering and pillaging and marauding(noun.act)

  Synonym:
  predation
  

  source: wordnet30
• (usually plural) a destructive action(noun.event)

  Example:
  The depredations of age and disease.
  

  Synonym:
  ravage
  

  source: wordnet30
• The act of depredating, or the state of being depredated; the act of despoiling or making inroads; as, the sea often makes depredation on the land.(noun)

  source: webster1913