The Collaborative International Dictionary of English v.0.48:

Forage \For"age\, v. i. [imp. & p. p. Foraged; p. pr. & vb. n.
   Foraging.]
   To wander or rove in search of food; to collect food, esp.
   forage, for horses and cattle by feeding on or stripping the
   country; to ravage; to feed on spoil.
   [1913 Webster]

         His most mighty father on a hill
         Stood smiling to behold his lion's whelp
         Forage in blood of French nobility.      --Shak.
   [1913 Webster]

   Foraging ant (Zool.), one of several species of ants of the
      genus Eciton, very abundant in tropical America,
      remarkable for marching in vast armies in search of food.


   Foraging cap, a forage cap.

   Foraging party, a party sent out after forage.
      [1913 Webster]

WordNet (r) 3.0 (2006):

foraging
    n 1: the act of searching for food and provisions [syn:
         foraging, forage]