The Collaborative International Dictionary of English v.0.48:

nonnative \nonnative\ adj.
   1. not being or composed of aborigines; as, the nonnative
      population of South Africa. Opposite of native.
      [WordNet 1.5]

   2. Of persons born in another area or country than that lived
      in; foreign-born; as, our large nonnative population.

   Syn: foreign-born.
        [WordNet 1.5]

   3. Originating in a different region and acclimated to a new
      environment; -- of plants or animals.

   Syn: domesticated, naturalized.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

nonnative
    adj 1: not being or composed of aborigines; "the nonnative
           population of South Africa" [ant: aboriginal, native]
    2: of persons born in another area or country than that lived
       in; "our large nonnative population" [syn: foreign-born,
       nonnative]
    3: of plants or animals originating in a part of the world other
       than where they are growing