Sig·is·mund (s?g??s-m?nd) 1368-1437. Holy Roman emperor (1410-1437) and king of Hungary (1387-1437) and Bohemia (1419-1437). He helped end the Great Schism (1378-1417) between two elected popes by convening the Council of Constance (1414-1418).American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Sigismund (?s???sm?nd) n (Biography) 1368?1437, king of Hungary (1387?1437) and of Bohemia (1419?37); Holy Roman Emperor (1411?37). He helped to end the Great Schism in the Church; implicated in the death of HussCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Sig?is?mund (?s?d? ?s m?nd, ?s?g ?s-) n. 1368?1437, Holy Roman emperor 1411?37. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.