The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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