Definition of Ex Officio
From office; by virtue of the office; without any other warrant or appointment than that resulting from the holding of a particular office. Powers may be exercised by an officer which are not specifically conferred upon him, but are necessarily implied in his office; these are ex officio. Thus, a judge has ex officio the powers of a conservator of the peace.
That's the definition of Ex Officio in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.
