wherein
1. where.in \hwer-'in, hwar-, wer-, war-, (.)(h)w*r-\ av : in what : in
what particular or respect {~ was he wrong}
2. wherein cj 1a: in which : WHERE {the city ~ he resides} 1b: during
which 2: in what way : HOW {showed him ~ he was wrong}
Webster's English Dictionary