adv
whereby
weh-uh-BEYE
adv
1
By which; through which.
"They set up a system whereby members vote online."
How to Use Whereby
Learner’s notesIn plain EnglishA formal word meaning "by which" or "through which."
When to use it
Common in formal, legal, or official writing rather than everyday conversation.
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They set up a system _____ members vote online.
Etymology
From "where" plus "by."