whereby

[ hwair-bahy, wair- ]

/ ʰwɛərˈbaɪ, wɛər- /

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

In what kind of society do we live, whereby these weapons are needed to defend and protect?

Pediatricians Take on the NRA Over Gun Safety |Brandy Zadrozny |May 15, 2014 |DAILY BEAST
With If This Then That, you can make a “recipe” whereby a certain trigger results in a different action.

3 Ways to Track Your Food and Feel Healthy |Ari Meisel |January 28, 2014 |DAILY BEAST
He hoped the Americans could broker a deal with the British whereby Iran would get at least a reasonable share of its own wealth.

The Little Girl Who Welcomed Mossadegh to New York |Michael Daly |September 27, 2013 |DAILY BEAST
A solo vocation beckons, whereby you desire to make an enduring mark.

The Stars Predict Your Week |Starsky + Cox |September 18, 2011 |DAILY BEAST

Is the default system, whereby passengers are always patted down by a TSA agent of the same sex, the appropriate one?

Who Pats Down Your Privates? |Conor Friedersdorf |November 19, 2010 |DAILY BEAST
But to leaue these impertinent discourses, and returne againe to the springs whereby our Pant or Gwin is increased.

Chronicles (1 of 6): The Description of Britaine |Raphaell Holinshed
Our general caused some calevers to be shot off at them, whereby, some being hurt, they might hereafter stand in more fear of us.

Voyages in Search of the North-West Passage |Richard Hakluyt
Whereby they discoursed in silence, and were intuitively understood from the theory of their Expresses.

The Works of Sir Thomas Browne (Volume 2 of 3) |Thomas Browne
A greater length of line can be utilized in trolling, whereby the fish is not so apt to see the angler.

Bass, Pike, Perch, and Others |James Alexander Henshall
What great crime have we committed, whereby we must for ever be divested of our country and rights?

American Institutions and Their Influence |Alexis de Tocqueville et al.

whereby

/ (wɛəˈbaɪ) /

by or because of which the means whereby he took his life

archaic how? by what means? whereby does he recognize me?