functus officio

adjective
func·​tus of·​fi·​cio | \ˈfəŋk-təs-ə-ˈfi-shē-ō, ˈfu̇ŋk-tu̇s-ȯ-ˈfē-kē-ō\

Legal Definition of functus officio 

: of no further official authority or legal effect the warrant… had been returned and was functus officioCady v. Dombrowski, 413 U.S. 433 (1973) once an arbitrator makes an award she is functus officio used especially of an officer who is no longer in office or of an instrument that has fulfilled its purpose

History and Etymology for functus officio

Latin, having performed his duty, having served its purpose

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