room·y (ro?o?m?, ro?om??)adj. room·i·er, room·i·est Having plenty of room; spacious: a roomy car that seats six comfortably. See Synonyms at spacious.room?i·ly adv.room?i·ness n.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.roomy (?ru?m?; ?r?m?) adj, roomier or roomiesthaving ample room; spacious ?roomily adv ?roominess nCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014room?y1 (?ru mi, ?r?m i) adj. room?i?er, room?i?est. affording ample room; spacious. [1615?25] room?i?ly, adv. room?i?ness, n. room?y2 (?ru mi, ?r?m i) n., pl. room?ies. Informal. roomie. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.