The Collaborative International Dictionary of English v.0.48:

Indonesian \In`do*ne"sian\, a. [Indo- + Gr. ? island.]
   Of or pertaining to Indonesia or Indonesians.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Indonesian \In`do*ne"sian\, n.
   1. A member of a race forming the chief pre-Malay population
      of the Malay Archipelago, and probably sprung from a
      mixture of Polynesian and Mongoloid immigrants. According
      to Keane, the autochthonous Negritos were largely expelled
      by the Caucasian Polynesians, themselves followed by
      Mongoloid peoples of Indo-Chinese affinities, from mixture
      with whom sprang the

   Indonesian race.
      [Webster 1913 Suppl.]

            The term Indonesian, introduced by Logan to
            designate the light-colored non-Malay inhabitants of
            the Eastern Archipelago, is now used as a convenient
            collective name for all the peoples of Malaysia and
            Polynesia who are neither Malay nor Papuans, but of
            Caucasic type. . . . The true Indonesians are of
            tall stature (5 ft. 10 in.), muscular frame, rather
            oval features, high, open forehead, large straight
            or curved nose, large full eyes always horizontal
            and with no trace of the third lid, light brown
            complexion (cinnamon or ruddy brown), long black
            hair, not lank but often slightly curled or wavy,
            skull generally brachycephalous like that of the
            melanochroic European.                --A. H. Keane.
      [Webster 1913 Suppl.]

            The Indonesians [of the Philippines], with the
            tribal population of some 251, 200, live almost
            exclusively on the great island of Mindanao. They
            are not only physically superior to the Negritos,
            but to the peoples of the Malayan race as well, and
            are, as a rule, quite intelligent.    --Rep. Phil.
                                                  Com., 1902.
      [Webster 1913 Suppl.]

   2. A native or inhabitant of Indonesia.
      [PJC]

WordNet (r) 3.0 (2006):

Indonesian
    adj 1: of or relating to or characteristic of Indonesia or its
           people or languages
    n 1: a native or inhabitant of Indonesia
    2: the dialect of Malay used as the national language of the
       Republic of Indonesia or of Malaysia [syn: Indonesian,
       Bahasa Indonesia, Bahasa]