Definition of ex officio adjective from the Oxford Advanced American Dictionary

 

ex officio

 adjective
adjective
NAmE//ˌɛks əˈfɪʃioʊ//
 
(from Latin)(formal)
 
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included or allowed because of your job, position, or rank an ex officio member of the committee
ex officioadverb
 
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He was present at the meeting ex officio.