/ Dictionary / Index M Mundelein: Meaning and Definition of Find definitions for: Mun•de•lein Pronunciation: (mun'dl-īn"), [key] — n. a city in NE Illinois. 17,053. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mundanity mundify Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language