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thereby

[th air-bahy, th air-bahy] /ˌðɛərˈbaɪ, ˈðɛərˌbaɪ/
adverb
1.
by that; by means of that.
2.
in that connection or relation:
Thereby hangs a tale.
3.
by or near that place.
4.
Scot. about that number, quantity, or degree.
Origin of thereby
900
before 900; Middle English therby, Old English thǣrbī. See there, by1
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for thereby

thereby

/ˌðɛəˈbaɪ; ˈðɛəˌbaɪ/
adverb
1.
by that means; because of that
2.
(archaic) by or near that place; thereabouts
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for thereby
adv.

Old English þærbig "by means of or because of that;" see there + by. Cf. German dabei, Dutch daarbij.

Online Etymology Dictionary, © 2010 Douglas Harper
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