Source : Webster's Revised Unabridged Dictionary (1913)

Internationalism \In`ter*na"tion*al*ism\, n.
   1. The state or principles of international interests and
      intercourse.

   2. The doctrines or organization of the International.

Source : WordNet®

internationalism
     n 1: the doctrine that nations should cooperate because their
          common interests are more important than their
          differences [ant: {nationalism}, {nationalism}]
     2: quality of being international in scope; "he applauded the
        internationality of scientific terminology" [syn: {internationality}]