[thair-bahy, thair-bahy]
by that; by means of that.
in that connection or relation: Thereby hangs a tale.
by or near that place.
Scot. about that number, quantity, or degree.

before 900; Middle English therby, Old English thǣrbī. See there, by1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thereby (ˌðɛəˈbaɪ, ˈðɛəˌbaɪ)
1.  by that means; because of that
2.  archaic by or near that place; thereabouts

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

O.E. þærbig "by means of or because of that;" see there + by. Cf. Ger. dabei, Du. daarbij.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Physical activity also helps the body use calories more efficiently, thereby
  helping in weight loss and maintenance.
Economists and other busybodies chide them for not spending more, thereby
  stimulating the economy.
If there are other such symmetries, they connect more bosons and fermions and
  thereby unify more aspects of our universe.
Religion placed immortal supernatural beings at the top of the clan, thereby
  reducing everyday violence between adherents.
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