The Collaborative International Dictionary of English v.0.48:

Pillage \Pil"lage\, n. [F., fr. piller to plunder. See Pill to
   plunder.]
   1. The act of pillaging; robbery. --Shak.
      [1913 Webster]

   2. That which is taken from another or others by open force,
      particularly and chiefly from enemies in war; plunder;
      spoil; booty.
      [1913 Webster]

            Which pillage they with merry march bring home.
                                                  --Shak.
      [1913 Webster]

   Syn: Plunder; rapine; spoil; depredation.

   Usage: Pillage, Plunder. Pillage refers particularly to
          the act of stripping the sufferers of their goods,
          while plunder refers to the removal of the things thus
          taken; but the words are freely interchanged.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pillage \Pil"lage\, v. i. [imp. & p. p. Pillaged; p. pr. & vb.
   n. Pillaging.]
   To strip of money or goods by open violence; to plunder; to
   spoil; to lay waste; as, to pillage the camp of an enemy.
   [1913 Webster]

         Mummius . . . took, pillaged, and burnt their city.
                                                  --Arbuthnot.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pillage \Pil"lage\, v. i.
   To take spoil; to plunder; to ravage.
   [1913 Webster]

         They were suffered to pillage wherever they went.
                                                  --Macaulay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pillage
    n 1: goods or money obtained illegally [syn: loot, booty,
         pillage, plunder, prize, swag, dirty money]
    2: the act of stealing valuable things from a place; "the
       plundering of the Parthenon"; "his plundering of the great
       authors" [syn: plundering, pillage, pillaging]
    v 1: steal goods; take as spoils; "During the earthquake people
         looted the stores that were deserted by their owners" [syn:
         plunder, despoil, loot, reave, strip, rifle,
         ransack, pillage, foray]

Moby Thesaurus II by Grady Ward, 1.0:

123 Moby Thesaurus words for "pillage":
   abduct, appropriate, arrogate, assault, attack, banditry,
   barbarize, batter, booty, brigandage, brigandism, brutalize,
   buccaneering, burn, butcher, carry off, carry on, confiscate,
   defilement, demolish, demolition, depredate, depredation,
   desecrate, desolate, despoil, despoiling, despoilment,
   despoliation, destroy, destruction, devastate, devastation, devour,
   direption, encroach, filch, fleece, forage, foraging, foray,
   freeboot, freebooting, go on, gut, hammer, invade, kidnap,
   lay waste, laying waste, level, lift, loot, looting, maraud,
   marauding, maul, mug, nab, pilfer, pillaging, pinch, piracy,
   plunder, plundering, prey on, purloin, rage, raid, raiding, ramp,
   rampage, ransack, ransacking, rant, rape, rapine, ravage,
   ravagement, ravaging, rave, raven, ravish, ravishment, raze,
   razing, razzia, reive, reiving, rifle, rifling, riot, roar, rob,
   robbery, ruin, sack, sacking, savage, shanghai, slaughter,
   sow chaos, spoil, spoiling, spoils, spoliate, spoliation, storm,
   strip, stripping, sweep, swipe, tear, tear around, terrorize,
   thieve, throttle, trespass, usurp, vandalize, violate, waste,
   wreck