/ Dictionary / Index Q Quintilian: Meaning and Definition of Find definitions for: Quin•til•ian Pronunciation: (kwin-til'yun, -ē-un), [key] — n. a.d.c35–c95, Roman rhetorician. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quintile quintillion Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language