fac·tion·al·ize (f?k?sh?-n?-l?z?)tr.v. fac·tion·al·ized, fac·tion·al·iz·ing, fac·tion·al·iz·es To split (a group, for example) into disputatious factions.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.factionalize (?fæk??n??la?z) or factionalisevb (tr) (Government, Politics & Diplomacy) rare to split into factionsCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014