/ Dictionary / Index P prosperous: Meaning and Definition of Find definitions for: pros•per•ous Pronunciation: (pros'pur-us), [key] — adj. having or characterized by financial success or good fortune; flourishing; successful: a prosperous business. well-to-do or well-off: a prosperous family. favorable or propitious. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: prosperous (Thesaurus) Prospero prosphora Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language