/ Dictionary / Index P prosper: Meaning and Definition of Find definitions for: pros•per Pronunciation: (pros'pur), [key] — v.i. to be successful or fortunate, esp. in financial respects; thrive; flourish. —v.t. to make successful or fortunate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: prosper (Thesaurus) prospectus prosperity Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language