The Collaborative International Dictionary of English v.0.48:

free-range \free-range\ adj.
   permitted to graze or forage rather than being confined to a
   feedlot; -- of livestock and domestic poultry.

   Syn: unenclosed.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

free-range
    adj 1: of livestock and domestic poultry; permitted to graze or
           forage rather than being confined to a feedlot