Definition from Wiktionary, the free dictionary
- By virtue of the office that originated it, or of the title held.
- The President of the Republic of France is, ex officio, also prince of the dyarchy called Andorra.
- Samuel Taylor Coleridge
- That friend […] added, with a smile, that he had more than once amused himself with the thought of a verbarian Attorney-General, authorized to bring informations ex officio against the writer or editor of any work in extensive circulation, who, after due notice issued, should persevere in misusing a word.