The Collaborative International Dictionary of English v.0.48:

organized \or"gan*ized\ adj.
   1. Same as arranged; as, an organized tour.
      [WordNet 1.5]

   2. Formed into an organization. Opposite of unorganized.
      [Narrower terms: corporate, incorporated]
      [WordNet 1.5]

   3. well-conducted. Opposite of disorganized. Also See:
      systematic.

   Syn: organized.
        [WordNet 1.5]

   4. Arranged according to a system or rule.

   Syn: systematized.
        [WordNet 1.5]

   5. Being a member of or formed into a labor union; -- of
      workers, used especially in the phrase "organized labor".
      Opposite of nonunion.

   Syn: unionized, union.
        [WordNet 1.5]