/ Dictionary / Index S sixty-fourth note: Meaning and Definition of Find definitions for: six'ty-fourth' note" Pronunciation: [key] — Music. Music. a note having one sixty-fourth of the time value of a whole note; hemidemisemiquaver. See illus. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sixty-fourth sixty-fourth rest 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