ex of·fi·cio 
/ˌɛksəˈfɪʃiˌoʊ/ adverb
/ˌɛksəˈfɪʃiˌoʊ/ adverb formal : because of your job, office, or position
▪ The Vice President serves ex officio as president of the Senate. [=being vice president means that you are also the president of the Senate]
▪ The Vice President serves ex officio as president of the Senate. [=being vice president means that you are also the president of the Senate]
— ex officio adjective
▪ ex officio members of the council
▪ ex officio members of the council
