Ex officio

1.

From office; by virtue, or as a consequence, of an office; officially.

Adj.	1.	ex officio - by virtue of an office or position; "the head of the department serves as an ex officio member of the board"
Adv.	1.	ex officio - by virtue of position; "the president sat on the committee ex officio" Synonyms: by right of office

EX OFFICIO. By virtue of his office. 2. Many powers are granted and exercised by public officers which are not expressly delegated. A judge, for example, may, ex officio, be a conservator of the peace, and a justice of the peace.

absolute, ascendant, authoritarian, authoritative, authorized, autocratic, clothed with authority, commanding, competent, consequential, considerable, controlling, dominant, duly constituted, eminent, empowered, ex cathedra, governing, great, hegemonic, hegemonistic, imperative, important, influential, leading, mighty, momentous, monocratic, official, potent, powerful, preeminent, prestigious, prominent, puissant, ranking, ruling, senior, substantial, superior, supreme, totalitarian, weighty