/ Dictionary / Index S sole-source: Meaning and Definition of Find definitions for: sole-source Pronunciation: (sōl'sôrs', -sōrs'), [key] — adj. designating a company contracted, without competition, to be the sole supplier of a product or service, as a firm having an exclusive contract for certain military technology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Solesmes sole trader Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language