\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.