Pro hac vice (pronounced "pro hack wee-chay"), Latin: "for this occasion" or "for this event", (literally, "for this turn"[1]) is a legal term usually referring to a lawyer who has not been admitted to practice in a certain jurisdiction but has been allowed to participate in a particular case in that jurisdiction.
The right to appear pro hac vice is not guaranteed. Rather, the attorney wanting to practice in a jurisdiction within which he or she is not licensed must specifically request permission from the court to be able to appear as an attorney of record. This is accomplished with a motion to appear pro hac vice, in which an attorney who is licensed in the jurisdiction requests that the non‐licensed attorney be admitted to practice in a particular case.
In addition to the motion, the non‐licensed attorney is typically required to provide the court with a statement from his local bar association indicating that he is a member in good standing and also pay a small fee to the local bar association.
The expression is also used when a Cardinal Deacon is promoted to Cardinal Priest and retains his titular Church. His deaconry is said to be elevated pro hac vice to title.