Millard Fillmore mil·lard·fill·more uncommon noun 1. elected Vice President and became the 13th President of the United States when Zachary Taylor died in office (1800-1874) SynonymsFillmoreMillard FillmorePresident Fillmore Related words Broader terms President of the United States WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.