Ex officio is used to describe something such as a rank or privilege that someone is entitled to because of the job or position they have. (FORMAL)
...~ members of the Advisory Council.
...an ex-officio degree.
ADJ: ADJ n
EX OFFICIO
Meaning of EX OFFICIO in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012