/ Dictionary / Index M middle C: Meaning and Definition of Find definitions for: middle C Pronunciation: [key] the note indicated by the first leger line above the bass staff and the first below the treble staff. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. middlebuster Middle Chinese Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language