/ Dictionary / Index M Mason City: Meaning and Definition of Find definitions for: Ma'son Cit'y Pronunciation: [key] a city in N Iowa. 30,144. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mason bee Mason-Dixon line Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language