Where‐in″ (?), adv.
1. In which; in which place, thing, time, respect, or the like; — used relatively.
Her clothes wherein she was clad. Chaucer.
There are times wherein a man ought to be cautious as well as innocent. Swift.
2. In what; — used interrogatively.
Yet ye say, Wherein have we wearied him! Mal. ii. 17.