As in Corpus Juris Secundum. I already know Corpus Juris means “body of law,” as in Corpus Juris Civilis.
Secundum has several uses, but I believe in this case it would be as “In accordance with”.
So, in accordance with the body of law.
Oh, also it is the title of an encyclopedia dedicated to American law. Link.
It’s a preposition, taking the accusative, and means, among other things “according to”. As an example, the various Gospels in Latin are described as secundum Lucam, *secundum Joannem * etc.
The title of the legal encyclopaedia *Corpis Juris Secundum * thus seems incomplete to me. The code of law according to…whom or what?
According to (heh) this answer to an email, in Corpus Juris Secundum the word secundum simply means second edition. Suppose the writers of C.J.S. saw themselves as followers of Justinian? Arrogant Americans… 
Remember that while secund|us/a/um can mean various things, usually “after”, “following” or “behind”, including others such as “according to”, those meanings all derive from the word’s basic meaning, “second” (as in numeral), of which secundum is the neuter form. The word “second” (as in time measurement) also comes from this. Romans called 60th part of an hour the first small part, pars minuta prima, and 60th part of this was the second small part, pars minuta secunda. In medieval times these were shortened to our minute and second.
Figures, it’s always the most obvious answer. :smack: 