/ Dictionary / Index S signature loan: Meaning and Definition of Find definitions for: sig'nature loan" Pronunciation: [key] a loan requiring no collateral. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. signature signature tune Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language