/ Dictionary / Index M master mason: Meaning and Definition of Find definitions for: mas'ter ma'son Pronunciation: [key] (often caps.) a Freemason who has reached the third degree. an expert mason. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. masterly master mechanic Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language