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whereby

[hwair-bahy, wair-]
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conjunction, adverb
  1. by what or by which; under the terms of which.
  2. Obsolete. by what? how?
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Origin of whereby

First recorded in 1150–1200, whereby is from the Middle English word wherby. See where, by1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for whereby

whereby

pronoun
  1. by or because of whichthe means whereby he took his life
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adverb
  1. archaic how? by what means?whereby does he recognize me?
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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

Word Origin and History for whereby

adv.

c.1200, from where + by.

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Online Etymology Dictionary, © 2010 Douglas Harper