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whereby

[hwair-bahy, wair-] /ʰwɛərˈbaɪ, wɛər-/
conjunction, adverb
1.
by what or by which; under the terms of which.
2.
Obsolete. by what? how?
Origin of whereby
1150-1200
1150-1200; Middle English wherby. See where, by1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for whereby

whereby

/wɛəˈbaɪ/
pronoun
1.
by or because of which: the means whereby he took his life
adverb
2.
(archaic) how? by what means?: whereby does he recognize me?
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for whereby
adv.

c.1200, from where + by.

Online Etymology Dictionary, © 2010 Douglas Harper
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