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

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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.
On the other hand, Guevarra, who is an Ex Officio member of the JBC, explained that the appointment is "subject to confirmation by the Commission on Appointments (CA)."
One digital platform has registered on its own and others are being registered ex officio.Foreign digital platforms, which mediate services in transport and accommodation in Slovakia, are obliged to launch so-called permanent establishments in Slovakia.
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.
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.
CAREER DEVELOPMENT & SERVICES: Sheridan Stormes, chair (2005, extending to 2011); Beth Christensen (2007-13), Michael Duffy (2006-12), Susannah Cleveland (ex officio).
De officio martiti: Introduction, Critical Edition, Translation and Notes.