/ Dictionary / Index M monosyllable: Meaning and Definition of Find definitions for: mon•o•syl•la•ble Pronunciation: (mon'u-sil"u-bul), [key] — n. a word of one syllable, as yes or no. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: monosyllable (Thesaurus) monosyllabism monosymmetric Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language