/ Dictionary / Index M Monessen: Meaning and Definition of Find definitions for: Mo•nes•sen Pronunciation: (mu-nes'un, mō-), [key] — n. a city in SW Pennsylvania, on the Monongahela River. 11,928. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. monesia monestrous Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language