whereby

[hwair-bahy, wair-]
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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

Related Words for whereby

how

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British Dictionary definitions for whereby

whereby

pronoun
  1. by or because of whichthe means whereby he took his life
adverb
  1. 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

Word Origin and History for whereby
adv.

c.1200, from where + by.

Online Etymology Dictionary, © 2010 Douglas Harper