(ˈ) ̷ ̷| ̷ ̷ adverb
Etymology: Middle English wherby, from where, wher where + by
1.
a. : by or through which : by the help of which : in accordance with which
the means whereby such an end is effected — Norman Friedman
the old logic of judgment, whereby discipline meant salvation — D.R.Meyer
b. archaic : near or along which
the throne whereby she fell — Alfred Tennyson
2. obsolete : by what : how
whereby shall I know this — Lk 1:18 (Authorized Version)
3.
a. : as a result of which : in consequence of which
a respite, four days' grace, whereby she told her story to the world — Robert Browning
b. chiefly dialect : whereupon
whereby thou didst desire to eat some, whereby I told thee they were ill for a green wound — Shakespeare