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Adjective: ex officio  eks u'fi-shee,ow
  1. By virtue of an office or position
    "the head of the department serves as an ex officio member of the board"
Adverb: ex officio  eks u'fi-shee,ow
  1. By virtue of position
    "the president sat on the committee ex officio";
    - by right of office

See also: official

Encyclopedia: Ex officio