gran·di·o·so (grän?d?-??s?, -z?, gr?n?-)adv. & adj. Music In a grand and noble style. Used chiefly as a direction.[Italian; see grandiose.]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.grandioso (??rænd????s??) adj, adv (Classical Music) music (to be played) in a grand mannerCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014