Definitions for: Ex Officio

[adv] by virtue of position; "the president sat on the committee ex officio"
[adj] by virtue of an office or position; "the head of the department serves as an ex officio member of the board"

Webster (1913) Definition: Ex` of*fi"ci*o; pl. Ex officiis. [L.]
From office; by virtue, or as a consequence, of an office;
officially.

Synonyms: by right of office, official