Source : Webster's Revised Unabridged Dictionary (1913)

Internationalize \In`ter*na"tion*al*ize\, v. t.
   To make international; to cause to affect the mutual
   relations of two or more nations; as, to internationalize a
   principle of law, or a philanthropic enterprise.

Source : WordNet®

internationalize
     v 1: put under international control; "internationalize trade of
          certain drugs" [syn: {internationalise}]
     2: make international in character; "We internationalized the
        committee" [syn: {internationalise}]