Webster's English Dictionary

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prosperous

pros.per.ous \'pra:s-p(*-)r*s\ aj [ME, fr. MF prospereux, fr. prosperer to 
   prosper + -eux -ous] 1: AUSPICIOUS, FAVORABLE  2a: marked by success or 
   economic well-being  2b: FLOURISHING  - pros.per.ous.ly av