verb (used without object)
to be successful or fortunate, especially in financial respects; thrive; flourish.
verb (used with object)
Archaic. to make successful or fortunate.

1425–75; late Middle English prosperen < Latin prosperāre to make happy, derivative of prosperus prosperous

unprospered, adjective
unprospering, adjective

1. See succeed.

1. fail. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prosper (ˈprɒspə)
(usually intr) to thrive, succeed, etc, or cause to thrive, succeed, etc in a healthy way
[C15: from Latin prosperāre to succeed, from prosperus fortunate, from pro-1 + spēs hope]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-15c., from O.Fr. prosperer (14c.), from L. prosperare "cause to succeed, render happy," from prosperus "favorable, fortunate, prosperous," perhaps lit. "agreeable to one's wishes," from Old L. pro spere "according to expectation," from pro "for" + abl. of spes "hope," from PIE base *spei- "to flourish,
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If you want to live in a nation that is prospering, make sure that its
  available energy supply is abundant.
Animals and plants seem to be prospering near the infamous nuclear reactor.
Yet highly developed social skills are in fact a hallmark of our big cities-and
  the cities are prospering because this is so.
If you want to live in a nation that is prospering make sure that its available
  energy supply is abundant.
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