Quin·til·ian (kw?n-t?l?y?n, -?-?n) Originally Marcus Fabius Quintilianus. First century ad. Roman rhetorician whose major work, the Institutio Oratoria, discusses the complete education and career of an orator.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.Quintilian (kw?n?t?lj?n) n (Biography) Latin name Marcus Fabius Quintilianus. ?35??96 ad, Roman rhetorician and teacherCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Quin?til?ian (kw?n?t?l y?n, -i ?n) n. (Marcus Fabius Quintilianus) A.D. c35?c95, Roman rhetorician. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.