1
general::
Phrase(s): to wit
namely; that is; that is to say. • The criminal was punished; to wit, he received a 20-year sentence. • Many students, to wit Mary, Bill, Sue, and Anne, complained about their teacher.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
That is to say, namely, as in There are three good reasons for not going, to wit, we don't want to, we don't have to, and we can't get a reservation. This expression comes from the now archaic verb to wit, meaning "know or be aware of," not heard except in this usage. [Late 1500s]
American Heritage Idioms