The Collaborative International Dictionary of English v.0.48:

Japanese \Jap`a*nese"\, a.
   Of or pertaining to Japan, or its inhabitants.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Japanese \Jap`a*nese"\, n. sing. & pl.
   [1913 Webster]
   1. A native or inhabitant of Japan; collectively, the people
      of Japan.
      [1913 Webster]

   2. sing. The language of the people of Japan, called in the
      Japanese language nihongo.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Japanese
    adj 1: of or relating to or characteristic of Japan or its
           people or their culture or language; "the Japanese
           Emperor"; "Japanese cars" [syn: Japanese, Nipponese]
    n 1: a native or inhabitant of Japan [syn: Japanese,
         Nipponese]
    2: the language (usually considered to be Altaic) spoken by the
       Japanese