The Collaborative International Dictionary of English v.0.48:

integrated \integrated\ adj.
   1. Formed or united into a whole.

   Syn: incorporate, incorporated, merged, unified.
        [WordNet 1.5]

   2. Formed into a whole or introduced into another entity; as,
      an integrated Europe. Opposite of nonintegrated.
      [Narrower terms: coordinated, interconnected,
      unified; embedded; incorporated; tight-knit,
      tightly knit]

            a more closely integrated economic and political
            system                                --Dwight D.
                                                  Eisenhower
      [WordNet 1.5]

   3. Having different groups treated together as equals in one
      group; as, racially integrated schools. [Narrower terms:
      co-ed, coeducational; desegrated, nonsegregated,
      unsegregated; interracial; mainstreamed] Also See:
      integrative, joint, united. Antonym: segregated.
      [WordNet 1.5 +PJC]

   4. Resembling a living organism in organization or
      development. [Narrower terms: organic (vs. inorganic)]

   Syn: structured.
        [WordNet 1.5]

   5. combined. Opposite of uncombined.
      [WordNet 1.5 +PJC]

   6. having constituent parts mixed to form a single unit.
      Opposite of unmixed. [Narrower terms: blended[2]]

   Syn: amalgamated, intermingled, mixed.
        [WordNet 1.5 +PJC]

The Collaborative International Dictionary of English v.0.48:

mainstreamed \main"streamed`\ adj. (Education)
   Placed in regular school classes; -- of the handicapped.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

mainstreamed
    adj 1: (of the handicapped) placed in regular school classes