/ Dictionary / Index S simple interest: Meaning and Definition of Find definitions for: sim'ple in'terest Pronunciation: [key] interest payable only on the principal; interest that is not compounded. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. simple honors simple interval Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language