Webster's English Dictionary

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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}