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whereby

[ wair-bahy, hwair- ]
/ wɛərˈbaɪ, ʰwɛər- /
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conjunction, adverb
by what or by which; under the terms of which.
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, by
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use whereby in a sentence

British Dictionary definitions for whereby

whereby
/ (wɛəˈbaɪ) /

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