[PAULUS libro singulari de iure singulari. ] §1.3.16.prIus singulare est, quod contra tenorem rationis propter aliquam utilitatem auctoritate constituentium introductum est.
[PAULUS on the Single Book on Singular Law] Singular law is that which, contrary to the tenor of reason, has been introduced for some utility by the authority of those who establish it.