/ Dictionary / Index M monotonal: Meaning and Definition of Find definitions for: mon•o•to•nal Pronunciation: (mon"u-tōn'l), [key] — adj. Print. having equal tone throughout, as sans-serif type. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. monotint monotone Related Content Daily Word Quiz: laudable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language