/ Dictionary / Index M master class: Meaning and Definition of Find definitions for: mas'ter class" Pronunciation: [key] a small class for advanced students, esp. a class in performance skills conducted by a distinguished musician. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Master Builder, The* master cylinder Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language