[hwair-bahy, wair-]
conjunction, adverb
by what or by which; under the terms of which.
Obsolete. by what? how?

1150–1200; Middle English wherby. See where, by1

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World English Dictionary
whereby (wɛəˈbaɪ)
1.  by or because of which: the means whereby he took his life
2.  archaic how? by what means?: whereby does he recognize me?

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Clustering is the phenomenon whereby firms from the same industry gather
  together in close proximity.
Quantum entanglement, whereby two or more objects are linked by an unseen
  connection, has some famously spooky effects.
Few human lives are not if the wit were prevalent whereby it might be done.
It is time for the owner to shuck his owner's syndrome, whereby he feels the
  business will only fail without him.
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