1. [v]  grow stronger; "The economy was booming"
2. [v]  gain in wealth

1. \Pros"per\, v. t. [imp. & p. p. {Prospered}; p. pr. &
   vb. n. {Prospering}.] [F. prosp['e]rer v. i., or L.
   prosperare, v. i., or L. prosperare, v. t., fr. prosper or
   prosperus. See {Prosperous}.]
   To favor; to render successful. ``Prosper thou our
   handiwork.'' --Bk. of Common Prayer.
         All things concur toprosper our design.  --Dryden.
   

2. \Pros"per\, v. i.
   1. To be successful; to succeed; to be fortunate or
      prosperous; to thrive; to make gain.
            They, in their earthly Canaan placed, Long time
            shall dwell and prosper.              --Milton.
   2. To grow; to increase. [Obs.]
            Black cherry trees prosper even to considerable
            timber.                               --Evelyn.
   

["PROSPER: A Language for Specification by Prototyping", J. Leszczylowski, Comp Langs 14(3):165-180 (1989)].