• (adv.) In what; -- used interrogatively. • (adv.) In which; in which place, thing, time, respect, or the like; -- used relatively.
Where·in' adverb 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...
[adv] - in regard to which 2. [adv] - in the course or during which 3. [adv] - in which 4. [adv] - in what