
1) English legal terminology 2) Latin legal terminology
Found on
https://www.crosswordclues.com/clue/nisi-prius

: (nee-see pree-us) adj. Latin for "unless first," in some jurisdictions it means the original trial court which heard a case as distinguished from a court of appeals, as in court nisi prius. "Court of original jurisdiction" is often substituted for the term nisi prius.
Found on
http://dictionary.law.com/Default.xhtml?selected=1326

Nisi prius is a historical term in English law. In the nineteenth century, it came to be used to denote generally all legal actions tried before judges of the King`s Bench Division and in the early twentieth century for actions tried at assize by a judge given a commission. Used in that way, the term has had no currency since the abolition of ass....
Found on
http://en.wikipedia.org/wiki/Nisi_prius

It is a phrase used for the original lower level or trial court (thus called "court of orginal jurisdiction") where the case was first heard by the judge and the jury, irrespective of where it is heard now. A common meaning is " unless before".
Found on
http://www.encyclo.co.uk/local/21213

These words which signify 'unless before' are the name of a court. The name originated as follows: Formerly, an action was triable only in the court where it was brought. But it was provided by Magna Carta that assises of novel disseisin and mort d'ancestor (then the most usual remedies,) should thenceforward instead of being tried at Westminster, ...
Found on
http://www.lectlaw.com/def2/n060.htm

Also calleda trial court for the hearing of civil cases before a judge and jury. · · a writ commanding a sheriff of a county to summon a jury and bring it to the court in Westminster on a certain day, unless the judges of assizes previously came to that county. · the clause with the words “nisi prius” introducing this writ. ...
Found on
https://www.infoplease.com/dictionary/nisi-prius
No exact match found.