/ Dictionary / Index C compound interest: Meaning and Definition of Find definitions for: com'pound in'terest Pronunciation: [key] interest paid on both the principal and on accrued interest. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. compound function compound interval 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