OFFICIO, EX. By virtue of one's office. Vide Ex officio; 3 Bl. Com. 447.

References in classic literature ?
Ex officio professors of Sabbath breaking are all whalemen.
Accident gave him the liberal end of the piece, a circumstance to which he never would have assented had he known the fact, for being an attache of the legation of his own country, he was ex officio aristocratic.
While still warm, the oil, like hot punch, is received into the six-barrel casks; and while, perhaps, the ship is pitching and rolling this way and that in the midnight sea, the enormous casks are slewed round and headed over, end for end, and sometimes perilously scoot across the slippery deck, like so many land slides, till at last man-handled and stayed in their course; and all round the hoops, rap, rap, go as many hammers as can play upon them, for now, ex officio, every sailor is a cooper.
Also that kind of obedience, which Tacitus speaketh of, is to be held suspected: Erant in officio, sed tamen qui mallent mandata imperantium interpretari quam exequi; disputing, excusing, cavilling upon mandates and directions, is a kind of shaking off the yoke, and assay of disobedience; especially if in those disputings, they which are for the direction, speak fearfully and tenderly, and those that are against it, audaciously.
Functus officio means the proclamation's mandate had expired because its purpose of addressing the 'violent acts committed by the Maute terrorist group' was already accomplished.
Gayen, presently posted as General Manager East Central Railway, has been appointed as new Member (Staff) Railway Board and ex officio Secretary to the Government of India on Wednesday.
The Secretary of the Department of Energy shall be the ex officio Chairman of the Board of Directors of both the PNOC-EC and the PNOC-RC.
There is possibility for ex officio public prosecution to initiate prosecution against this act, for which the government encourages the public prosecutor to check if there are elements of the crime under Article 181 of the Criminal Code Violation of reputation of foreign state and to act ex officio.
The European Commission has today taken a decision in principle to open an ex officio anti-dumping and an anti-subsidy investigation concerning imports of mobile telecommunications networks and their essential elements from China," a statement said.
De officio legati, De immunitate legatorum, De legationibus loannis Langiachi Episcopi Lemovicensis.
De officio martiti: Introduction, Critical Edition, Translation and Notes.
The decision eliminated the ex officio role of the local bishop, currently Archbishop Harry Flynn, as chair of the university's board.