Entry 1 sense Webster, 1913 Milliard /(F. mē̇l`yȧr"; E. mĭl"lĭ*ärd)/ · Mil·liard · IPA /ˈmɪliɑɹd/ 01 n. A thousand millions; -- usually called billion in the United States. See Billion. 1. A thousand millions; -- usually called billion in the United States. See Billion. Also: billion See: Billion