Source : Webster's Revised Unabridged Dictionary (1913)

Milliard \Mil`liard"\, n. [F., from mille, mil, thousand, L.
   mille.]
   A thousand millions; -- called also {billion}. See {Billion}.

Source : WordNet®

milliard
     n : a billion; "in England they call one thousand million a
         milliard"