Definition of ex officio in US English:

ex officio

adverb & adjective

  • By virtue of one's position or status.

    as adjective ‘an ex officio member of the committee’
    titular, nominal, in name only, in title only, unofficial, token, so-called
    View synonyms

Origin

Latin, from ex ‘out of, from’ + officium ‘duty’.

Pronunciation

ex officio

/ˌɛks əˈfɪʃioʊ//ˌeks əˈfiSHēō/