Source : Webster's Revised Unabridged Dictionary (1913)

Depredation \Dep`re*da"tion\, n. [L. depraedatio: cf. F.
   d['e]pr['e]dation.]
   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.

Source : WordNet®

depredation
     n 1: an act of plundering and pillaging and marauding [syn: {predation}]
     2: (usually plural) a destructive action; "the ravages of
        time"; "the depradations of age and disease" [syn: {ravage}]