Pro Hac Vice
the Latin word which means " on this occasion" or "only this time". Usually it refers to the lawyers who are not a part of the jurisdiction where a certain case is being heard and he/she may want to be the part of the case by practcing in that jurisdiction for this particular case only. The lawyer has to take the permission from the court of that jurisdiction by going for the Motion to appear pro hac vice which is applied by a lawyer who is already a part of that jurisdiction of court. The outside lawyer has prove his/her good standing in his/her own jurisdiction also.