verb (used without object), thrived or throve, thrived or thriven [thriv-uhn] , thriving.
to prosper; be fortunate or successful.
to grow or develop vigorously; flourish: The children thrived in the country.

1150–1200; Middle English thriven < Old Norse thrīfast to thrive, reflexive of thrīfa to grasp

thriver, noun
thrivingly, adverb
unthriving, adjective

1. advance. See succeed. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thrive (θraɪv)
vb , thrives, thriving, thrived, throve, thrived, thriven
1.  to grow strongly and vigorously
2.  to do well; prosper
[C13: from Old Norse thrīfask to grasp for oneself, reflexive of thrīfa to grasp, of obscure origin]

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

c.1200, from O.N. þrifask "to thrive," originally "grasp to oneself," probably from O.N. þrifa "to clutch, grasp, grip" (cf. Swed. trifvas, Dan. trives "to thrive, flourish"), of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In fact, it is in the best interest of any administration that each and every
  one of its programs thrives.
Under the threat of litigation, scientists cannot test a seed to explore the
  different conditions under which it thrives or fails.
When a mutation produces a feature that is advantageous that organism survives
  and thrives, and it's kind persists.
If anything, since then the use of chemicals has become much more widespread
  and the robin still thrives.
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