whereby

American  

[wair-bahy, hwair-] / wɛərˈbaɪ, ʰwɛər- /

conjunction

1. by what or by which; under the terms of which.

2. Obsolete.  by what? how?

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whereby British  

/ wɛəˈbaɪ /

pronoun

1. by or because of which

   the means whereby he took his life

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adverb

1. archaic  how? by what means?

   whereby does he recognize me?

Etymology

Origin of whereby

First recorded in 1150–1200, whereby is from the Middle English word wherby. See where, by

Example Sentences

He pioneered a style whereby callers had to be on their mettle because he was known to treat them in the same way he would treat a politician.

From BBC

Fracking is a method of mining that first became widespread in the US in the early 2000s, whereby a high-pressure mixture of water, sand and chemicals is injected into the ground.

From BBC

Shortly afterward, Peak announced an agreement with Shenghe whereby the Chinese company would receive between 75% to 100% of the mine’s output for seven years.

From The Wall Street Journal

The Japanese are very big savers and the yen is a major funding currency for the carry trade — whereby investors short the low-yielding, generally depreciating yen to fund riskier wagers on other assets in other currencies — and its weakness since spring has partly boosted demand for tech and AI-related stocks in America.

From MarketWatch

As Dickens must have observed, the often gnarly sounds of English words seem to have sprouted directly from the soil of the British Isles, whereby, in order to utter them, we had to heft the vocal counterparts of stones or cut through auditory brambles.

From The Wall Street Journal