/ Dictionary / Index C compound interval: Meaning and Definition of Find definitions for: com'pound in'terval Pronunciation: [key] — Music. Music. an interval that is greater than an octave, as a ninth or a thirteenth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. compound interest compound leaf Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language