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Definition of ex cathedra in English:

ex cathedra

adverb

  • With the full authority of office (especially that of the Pope, implying infallibility as defined in Roman Catholic doctrine)

    • ‘for an encyclical to be infallible the Pope must speak ex cathedra’
    lawful, legitimate, licit, within the law, legalized, valid

Pronunciation

ex cathedra

/ˌeks kəˈTHēdrə/ /ˌɛks kəˈθidrə/

adjective

  • Issued with the full authority of office (especially that of the Pope, implying infallibility as defined in Roman Catholic doctrine)

    ‘ex cathedra statements’
    • ‘an ex cathedra decree’

Pronunciation

ex cathedra

/ˌeks kəˈTHēdrə/ /ˌɛks kəˈθidrə/

Origin

Latin, ‘from the (teacher's) chair’, from ex ‘from’ and cathedra ‘seat’ (see cathedral).