whereby

adv

1. (interrogative, not-comparable, obsolete)By what, in which direction; how.

   “Whereby goest thou?”

2. (not-comparable)By which.

   “Shylock: Nay, take my life and all; pardon not that: You take my house when you do take the prop That doth sustain my house; you take my life When you do take the means whereby I live.”

   “M. Sawrey […] devised a mechanical method whereby theatrical scenes could be changed in a simple way.”

   “Other heads saw devolution as a whole new way of life and adopted an approach whereby the power of devolution was used to enable the school to drive the curriculum.”

3. (nonstandard, not-comparable)Where, wherein, in which.

   “Because COBOL does not have a date type, some implementations rely instead on a system whereby all dates are coded to a reference point. The most commonly used is May 20, 1875, as this was the date of an international standards-setting conference held in Paris, known as the Convention du Mètre.”