Source : Webster's Revised Unabridged Dictionary (1913)

Fraternization \Fra`ter*ni*za"tion\ (? or ?), n.
   The act of fraternizing or uniting as brothers.

         I hope that no French fraternization . . . could so
         change the hearts of Englishmen.         --Burke.

Source : WordNet®

fraternization
     n : associating with others in a brotherly or friendly way;
         especially with an enemy [syn: {fraternisation}]