/ Dictionary / Index B Black Mass: Meaning and Definition of Find definitions for: Black' Mass' Pronunciation: [key] a blasphemous ceremony mocking the Christian Mass, esp. one by an alleged worshiper of Satan. a Requiem Mass. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. black-marketeer black measles Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language