“The Court becomes functus officio when its task or the task before it is completely performed. Functus officio, a Latin term, means “task performed”. It means, as this Court stated in Mohammed v. Husseini (1998) 14 NWLR (pt. 584) 108 at pages 163 – 164, that the judge or the Court cannot give a decision twice or make an order on the matter twice. In other words, once a Court or judge makes a final order on a matter, it (or he) no longer has the competence or jurisdiction to give another decision or order on the same matter. The Court or the Judge, once it gives final judgment on a matter, it (or he) from thenceforth becomes functus officio”. 

PER E.EKO, J.S.C in FEDERAL REPUBLIC OF NIGERIA V ALH. ABUBAKAR MAISHANU & 2 ORS