[ hwair-bahy, wair- ]
/ ʰwɛərˈbaɪ, wɛər- /

conjunction, adverb

by what or by which; under the terms of which.
Obsolete. by what? how?

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. 2019

Examples from the Web for whereby

British Dictionary definitions for whereby


/ (wɛəˈbaɪ) /


by or because of whichthe means whereby he took his life


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



c.1200, from where + by.

Online Etymology Dictionary, © 2010 Douglas Harper